ORCID Profile
0000-0003-4489-4926
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Atomic, Molecular, Nuclear, Particle and Plasma Physics | Atomic And Molecular Physics | Condensed Matter Physics—Structural Properties | Atomic and Molecular Physics | Condensed Matter Physics—Other | Materials Engineering Not Elsewhere Classified | Medical Physics | Medical Physics | Biophysics
ANZSRC Socio-Economic Objective (SEO)
Physical sciences | Expanding Knowledge in the Physical Sciences | Other | Polymeric materials (e.g. paints) | Higher education | Biological sciences | Chemical sciences | Expanding Knowledge in the Medical and Health Sciences | Scientific instrumentation |
Related Links
Publications
A trap-based positron beamline for the study of materials
Publisher: IOP Publishing
Date: 29-06-2010
Low energy positron interactions - Trapping, transport and scattering
Publisher: IOP Publishing
Date: 04-2009
Low energy positron interactions with uracil-Total scattering, positronium formation, and differential elastic scattering cross sections
Publisher: AIP Publishing
Date: 18-07-2014
DOI: 10.1063/1.4887072
Abstract: Measurements of the grand total and total positronium formation cross sections for positron scattering from uracil have been performed for energies between 1 and 180 eV, using a trap-based beam apparatus. Angular, quasi-elastic differential cross section measurements at 1, 3, 5, 10, and 20 eV are also presented and discussed. These measurements are compared to existing experimental results and theoretical calculations, including our own calculations using a variant of the independent atom approach.
An experimental and theoretical study of transient negative ions in Mg, Zn, Cd and Hg
Publisher: IOP Publishing
Date: 09-12-2003
Positron scattering from neon and argon
Publisher: American Physical Society (APS)
Date: 03-03-2011
Positron scattering from molecular hydrogen
Publisher: American Physical Society (APS)
Date: 31-10-2013
Leaching properties of chromate-containing epoxy films using radiotracers, PALS and SEM
Publisher: Elsevier BV
Date: 2014
A comparison of experimental and theoretical low energy positron scattering from furan
Publisher: AIP Publishing
Date: 22-12-0019
DOI: 10.1063/5.0027874
Abstract: This paper presents a joint experimental and theoretical study of positron scattering from furan. Experimental data were measured using the low energy positron beamline located at the Australian National University and cover an energy range from 1 eV to 30 eV. Cross sections were measured for total scattering, total elastic and inelastic scattering, positronium formation, and differential elastic scattering. Two theoretical approaches are presented: the Schwinger multichannel method and the independent atom method with screening corrected additivity rule. In addition, our data are compared to corresponding electron scattering results from the same target with a number of significant differences observed and discussed.
Search for positron quasibound states in the doubly excited region of the helium atom
Publisher: American Physical Society (APS)
Date: 05-12-2012
Regularities in positronium formation for atoms and molecules
Publisher: IOP Publishing
Date: 23-02-2016
DOI: 10.1088/0953-4075/49/6/064003
Abstract: In an effort to aid the modelling of positron and positronium (Ps) transport in biological media we have compiled recent experimental results for the total Ps formation in positron scattering from atoms and molecules. A simple function was found to adequately describe the total Ps formation cross section for both atoms and molecules. The parameters of this function describe the magnitude and shape of the Ps formation cross section and are compared to physical characteristics of the target atoms and molecules. A general trend in the magnitude of the total Ps formation cross section is observed as a function of the target atom/molecule dipole polarisability. The functional form may enable quick estimation of the Ps cross section for molecules for which experimental measurements or theoretical estimates do not exist.
Electron scattering from pyrazine: Elastic differential and integral cross sections
Publisher: AIP Publishing
Date: 27-11-2012
DOI: 10.1063/1.4767570
Abstract: We report on new measurements for elastic electron scattering from pyrazine. Absolute differential cross sections (DCSs) at seven discrete energies in the range 3–50 eV, and over the scattered electron angular range 10°–129°, were determined using a crossed electron-molecular beam spectrometer in conjunction with the well-established relative flow technique. Integral elastic cross sections were subsequently derived from those DCS data at each energy. Where possible comparison between the present results and those from sophisticated Schwinger multichannel and R-matrix computations is made, with generally quite good quantitative accord being found. Finally, in order to better study some of the rich resonance structure predicted by theory, results from elastic electron excitation functions are presented.
Elastic electron scattering from argon at low incident energies
Publisher: IOP Publishing
Date: 28-07-1996
Low energy positron scattering and annihilation studies using a high resolution trap-based beam
Publisher: Elsevier BV
Date: 05-2002
Experimental and theoretical cross sections for positron collisions with 3-hydroxy-tetrahydrofuran
Publisher: AIP Publishing
Date: 15-02-2013
DOI: 10.1063/1.4790620
Abstract: Cross section results from a joint experimental and theoretical investigation into positron scattering from 3-hydroxy-tetrahydrofuran (3H-THF) are presented. Total and positronium (Ps) formation cross sections have been measured from 1 to 190 eV using the positron beamline at the Australian National University, which has an energy resolution between 60 and 100 meV. The total cross section (TCS) and the elastic and total inelastic integral cross sections in the energy range between 1 and 1000 eV have been computed within the Independent Atom Model using the Screening Corrected Additivity Rule approach. In addition, we have calculated elastic differential cross sections at selected incident energies. Our computations represent the first theoretical results reported for this target species, while our measured Ps formation cross sections are also novel. Comparison of the present TCS with the previous results from the University of Trento shows a good level of agreement at the lowest energies. We also provide a comparison between the present cross sections for 3H-THF and those from our earlier study on the parent molecule tetrahydrofuran.
Excitation of the n=2 states of helium by positron impact
Publisher: American Physical Society (APS)
Date: 07-12-2009
High-resolution positron scattering from helium: Grand total and positronium-formation cross sections
Publisher: American Physical Society (APS)
Date: 22-09-2009
World Federation of Societies of Biological Psychiatry (WFSBP) Guidelines for Biological Treatment of Unipolar Depressive Disorders, Part 1: Update 2013 on the acute and continuation treatment of unip
Publisher: Informa UK Limited
Date: 07-2013
DOI: 10.3109/15622975.2013.804195
Abstract: This 2013 update of the practice guidelines for the biological treatment of unipolar depressive disorders was developed by an international Task Force of the World Federation of Societies of Biological Psychiatry (WFSBP). The goal has been to systematically review all available evidence pertaining to the treatment of unipolar depressive disorders, and to produce a series of practice recommendations that are clinically and scientifically meaningful based on the available evidence. The guidelines are intended for use by all physicians seeing and treating patients with these conditions. The 2013 update was conducted by a systematic update literature search and appraisal. All recommendations were approved by the Guidelines Task Force. This first part of the guidelines (Part 1) covers disease definition, classification, epidemiology, and course of unipolar depressive disorders, as well as the management of the acute and continuation phase treatment. It is primarily concerned with the biological treatment (including antidepressants, other psychopharmacological medications, electroconvulsive therapy, light therapy, adjunctive and novel therapeutic strategies) of adults. To date, there is a variety of evidence-based antidepressant treatment options available. Nevertheless there is still a substantial proportion of patients not achieving full remission. In addition, somatic and psychiatric comorbidities and other special circumstances need to be more thoroughly investigated. Therefore, further high-quality informative randomized controlled trials are urgently needed.
Positron scattering from pyrazine
Publisher: American Physical Society (APS)
Date: 12-10-2021
Investigations into the free-volume changes within starch/plasticizer/nanoclay systems using Positron Annihilation Lifetime Spectroscopy
Publisher: Elsevier BV
Date: 11-2014
Low-energy elastic and inelastic scattering of positrons from argon
Publisher: American Physical Society (APS)
Date: 24-02-2016
A joint theoretical and experimental study for elastic electron scattering from 1,4-dioxane
Publisher: AIP Publishing
Date: 02-07-2013
DOI: 10.1063/1.4812215
Abstract: We present results of measurements and calculations of elastic electron scattering from 1,4-dioxane in the energy range of 0–1000 eV. Absolute differential and integral elastic cross sections have been measured using a crossed electron-molecule beam spectrometer and the relative flow technique, at four energies in the 10–30 eV range and for scattered electrons in the angular range 20°–129°. The measured cross sections are compared with results from R-matrix computations, at the static exchange plus polarization level, calculated at energies between 0–20 eV, and with calculations employing the independent atom model with the screening corrected additivity rule (IAM-SCAR). Those latter computations were conducted at energies between 1 and 1000 eV. Agreement between the measured and R-matrix cross sections was typically found to be good at all common energies, whereas agreement with IAM-SCAR was satisfactory only at 30 eV. To the best of our knowledge, the present results are the first absolute data to be published in the literature for this scattering system.
Defect complexes in fluorine-implanted germanium
Publisher: IOP Publishing
Date: 27-11-2013
Positron scattering from pyrimidine
Publisher: American Physical Society (APS)
Date: 31-07-2013
Positron scattering from atoms and molecules using a magnetized beam
Publisher: American Physical Society (APS)
Date: 15-10-2002
Effect of W self-implantation and He plasma exposure on early-stage defect and bubble formation in tungsten
Publisher: IOP Publishing
Date: 18-04-2018
Forward angle scattering effects in the measurement of total cross sections for positron scattering
Publisher: IOP Publishing
Date: 17-01-2011
Near-Threshold Ionization of Argon by Positron Impact
Publisher: American Physical Society (APS)
Date: 13-03-2018
High Resolution Positron Interactions
Publisher: IOP Publishing
Date: 11-2009
Elastic scattering and electronic excitation in positron interactions with neon
Publisher: IOP Publishing
Date: 24-03-2021
Abstract: We report measurements of low energy positron scattering from neon, with the first measurements of absolute differential cross sections (DCSs) and of state-selective electronic excitation. These measurements are compared to calculations using the relativistic optical potential (ROP) technique, as well as other recently published theoretical calculations. At the lowest energies, experimental DCS data are fitted to extract scattering phase shifts, which can be compared to theoretical values and also used to generate DCS values over the full angular range. For the most part we find good accord in the two descriptions of the scattering processes, with some key disagreements. An analysis of possible sources of systematic error has also been presented, in light of the discrepancies.
Radiation tolerance of two-dimensional material-based devices for space applications
Publisher: Springer Science and Business Media LLC
Date: 13-03-2019
DOI: 10.1038/S41467-019-09219-5
Abstract: Characteristic for devices based on two-dimensional materials are their low size, weight and power requirements. This makes them advantageous for use in space instrumentation, including photovoltaics, batteries, electronics, sensors and light sources for long-distance quantum communication. Here we present a comprehensive study on combined radiation effects in Earth’s atmosphere on various devices based on these nanomaterials. Using theoretical modeling packages, we estimate relevant radiation levels and then expose field-effect transistors, single-photon sources and monolayers as building blocks for future electronics to γ -rays, protons and electrons. The devices show negligible change in performance after the irradiation, suggesting robust suitability for space use. Under excessive γ -radiation, however, monolayer WS 2 shows decreased defect densities, identified by an increase in photoluminescence, carrier lifetime and a change in doping ratio proportional to the photon flux. The underlying mechanism is traced back to radiation-induced defect healing, wherein dissociated oxygen passivates sulfur vacancies.
The `5.2 eV resonance' in electron scattering from Hg
Publisher: IOP Publishing
Date: 28-12-1998
Elastic electron scattering from 3-hydroxytetrahydrofuran: experimental and theoretical studies
Publisher: IOP Publishing
Date: 06-05-2008
Kinetic Phenomena in Transport of Electrons and Positrons in Gases caused by the Properties of Scattering Cross Sections
Publisher: IOP Publishing
Date: 10-04-2014
Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions
Publisher: IOP Publishing
Date: 09-08-2019
Abstract: We publish three Roadmaps on photonic, electronic and atomic collision physics in order to celebrate the 60th anniversary of the ICPEAC conference. In Roadmap II we focus on electron and antimatter interactions. Modern theoretical and experimental approaches provide detailed insight into the many body quantum dynamics of leptonic collisions with targets of varying complexity ranging from neutral and charged atoms to large biomolecules and clusters. These developments have been driven by technological progress and by the needs of adjacent areas of science such as astrophysics, plasma physics and radiation biophysics. This Roadmap aims at looking back along the road, explaining the evolution of the field, and looking forward, collecting contributions from eighteen leading groups from the field.
Low energy positron scattering from helium
Publisher: IOP Publishing
Date: 10-2008
Low-energy electron scattering from O2
Publisher: IOP Publishing
Date: 14-10-1995
Spatial profiles of positrons injected at low energies into water: influence of cross section models
Publisher: IOP Publishing
Date: 15-03-2017
Ending aging in super glassy polymer membranes
Publisher: Wiley
Date: 16-04-2014
Abstract: Aging in super glassy polymers such as poly(trimethylsilylpropyne) (PTMSP), poly(4-methyl-2-pentyne) (PMP), and polymers with intrinsic microporosity (PIM-1) reduces gas permeabilities and limits their application as gas-separation membranes. While super glassy polymers are initially very porous, and ultra-permeable, they quickly pack into a denser phase becoming less porous and permeable. This age-old problem has been solved by adding an ultraporous additive that maintains the low density, porous, initial stage of super glassy polymers through absorbing a portion of the polymer chains within its pores thereby holding the chains in their open position. This result is the first time that aging in super glassy polymers is inhibited whilst maintaining enhanced CO2 permeability for one year and improving CO2/N2 selectivity. This approach could allow super glassy polymers to be revisited for commercial application in gas separations.
Single electron tracks in water vapour for energies below 100 eV
Publisher: Elsevier BV
Date: 11-2008
Simulations of pulses in a buffer gas positron trap
Publisher: IOP Publishing
Date: 2011
Low energy positron interactions with rare gas atoms: threshold features and benchmark cross sections
Publisher: IOP Publishing
Date: 2011
Scattering data for modelling positron tracks in gaseous and liquid water
Publisher: IOP Publishing
Date: 15-06-2016
Low energy lepton scattering: recent results for electron and positron interactions
Publisher: IOP Publishing
Date: 10-2008
Low-energy electron and positron transport in gases and soft-condensed systems of biological relevance
Publisher: Elsevier BV
Date: 2014
DOI: 10.1016/J.APRADISO.2013.01.008
Abstract: We present a study of electron and positron transport in water in both the gaseous and liquid states using a Boltzmann equation analysis and a Monte-Carlo simulation technique. We assess the importance of coherent scattering processes when considering transport of electrons ositrons in dense gases and liquids. We highlight the importance of electron and positron swarm studies and experiments as a test of the accuracy and completeness of cross-sections, as well as a technique for benchmarking Monte-Carlo simulations. The thermalization of low-energy positrons (<150 eV) in water is discussed and the sensitivity of the profiles to the form of the cross-sections in this energy region, and assumptions in the microscopic processes, is considered.
Benchmark measurements and theory for electron(positron)-molecule(atom) scattering
Publisher: Elsevier BV
Date: 06-2006
Threshold effects in positron scattering from isoelectronic series of atoms and molecules
Publisher: American Physical Society (APS)
Date: 13-03-0009
Data for modeling of positron collisions and transport in gases
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4815846
High-resolution, low-energy positron scattering from helium: measurements of the total scattering cross section
Publisher: IOP Publishing
Date: 03-04-2008
Total and positronium formation cross sections for positron scattering from H2 O and HCOOH
Publisher: IOP Publishing
Date: 21-10-2009
Low-energy elastic electron interactions with pyrimidine
Publisher: American Physical Society (APS)
Date: 02-12-2011
A positron trap and beam apparatus for atomic and molecular scattering experiments
Publisher: AIP Publishing
Date: 11-2008
DOI: 10.1063/1.3030774
Abstract: An instrument has been designed and constructed to provide new insights into fundamental, low energy positron scattering processes. The design is based on the Surko trap system and produces a pulsed positron beam with an energy resolution of as good as 54 meV. The design and operation of the apparatus is explained, while the first experimental results from this apparatus have been demonstrated in recent publications.
Nano-porosity in GaSb induced by swift heavy ion irradiation
Publisher: AIP Publishing
Date: 13-01-2014
DOI: 10.1063/1.4861747
Abstract: Nano-porous structures form in GaSb after ion irradiation with 185 MeV Au ions. The porous layer formation is governed by the dominant electronic energy loss at this energy regime. The porous layer morphology differs significantly from that previously reported for low-energy, ion-irradiated GaSb. Prior to the onset of porosity, positron annihilation lifetime spectroscopy indicates the formation of small vacancy clusters in single ion impacts, while transmission electron microscopy reveals fragmentation of the GaSb into nanocrystallites embedded in an amorphous matrix. Following this fragmentation process, macroscopic porosity forms, presumably within the amorphous phase.
Total, elastic, and inelastic cross sections for positron and electron collisions with tetrahydrofuran
Publisher: AIP Publishing
Date: 15-02-2013
DOI: 10.1063/1.4789584
Abstract: We present total, elastic, and inelastic cross sections for positron and electron scattering from tetrahydrofuran (THF) in the energy range between 1 and 5000 eV. Total cross sections (TCS), positronium formation cross sections, the summed inelastic integral cross sections (ICS) for electronic excitations and direct ionization, as well as elastic differential cross sections (DCS) at selected incident energies, have been measured for positron collisions with THF. The positron beam used to carry out these experiments had an energy resolution in the range 40–100 meV (full-width at half-maximum). We also present TCS results for positron and electron scattering from THF computed within the independent atom model using the screening corrected additivity rule approach. In addition, we calculated positron-impact elastic DCS and the sum over all inelastic ICS (except rotations and vibrations). While our integral and differential positron cross sections are the first of their kind, we compare our TCS with previous literature values for this species. We also provide a comparison between positron and electron-impact cross sections, in order to uncover any differences or similarities in the scattering dynamics with these two different projectiles.
Excitation of Electronic States of Ar,H 2 <
Publisher: American Physical Society (APS)
Date: 25-07-2001
Low energy electron scattering from pyridine using a Surko trap and beam
Publisher: IOP Publishing
Date: 08-12-2021
Abstract: This paper presents measurements of low energy electron scattering from pyridine. The low energy positron beamline at the Australian National University was used for these measurements, with a change in operational parameters allowing for the measurement of electron scattering processes. We have collected data for the low energy total cross section for electron scattering, as well as measurements of the differential cross sections for electrons up to 3 eV impact energy. The operation of the beamline will be briefly outlined and data are compared to R -matrix and Schwinger multichannel theoretical calculations, as well as previous experimental data.
Molecular pore size characterization within chitosan biopolymer using positron annihilation lifetime spectroscopy
Publisher: Elsevier BV
Date: 12-2010
A pulsed positronium beam using a positron buffer gas trap
Publisher: AIP Publishing
Date: 06-03-2021
DOI: 10.1063/1.5128012
Abstract: We describe the operation of a pulsed positronium beam based on a two-stage buffer gas positron trap (BGT) or a Surko trap. The BGT allows the areal density and temporal spread of the positron beam to be tailored. This tailored positron beam is used to form a positronium beam via charge exchange with an atomic or molecular gas. The resulting positronium beam is energy tunable, and the collimated beam relies on the angular differential positronium production cross section of the atomic or molecular gas used.
Characterisation of metakaolin-based geopolymers using beam-based and conventional PALS
Publisher: IOP Publishing
Date: 2011
Role of F on the Electrical Activation of As in Ge
Publisher: The Electrochemical Society
Date: 2012
DOI: 10.1149/2.009203JSS
Elastic electron scattering from formic acid (HCOOH): absolute differential cross-sections
Publisher: IOP Publishing
Date: 05-06-2006
A new technique for measuring positron impact direct ionisation
Publisher: Springer Science and Business Media LLC
Date: 12-2017
Observation of Threshold Effects in Positron Scattering from the Noble Gases
Publisher: American Physical Society (APS)
Date: 13-08-2010
Positron interactions with water–total elastic, total inelastic, and elastic differential cross section measurements
Publisher: AIP Publishing
Date: 28-01-2014
DOI: 10.1063/1.4862685
Abstract: Utilising a high-resolution, trap-based positron beam, we have measured both elastic and inelastic scattering of positrons from water vapour. The measurements comprise differential elastic, total elastic, and total inelastic (not including positronium formation) absolute cross sections. The energy range investigated is from 1 eV to 60 eV. Comparison with theory is made with both R-Matrix and distorted wave calculations, and with our own application of the Independent Atom Model for positron interactions.
Comment on “Semiempirical potentials for positron scattering by atoms”
Publisher: American Physical Society (APS)
Date: 19-03-2012
Low energy positron scattering from helium
Publisher: Elsevier BV
Date: 02-2008
Absolute elastic cross-sections for low-energy electron scattering from tetrahydrofuran
Publisher: IOP Publishing
Date: 26-02-2007
Search for resonances in the scattering of low-energy positrons from atoms and molecules
Publisher: IOP Publishing
Date: 13-07-2001
Positron scattering from pyridine
Publisher: AIP Publishing
Date: 11-04-2018
DOI: 10.1063/1.5024246
Abstract: We present a range of cross section measurements for the low-energy scattering of positrons from pyridine, for incident positron energies of less than 20 eV, as well as the independent atom model with the screening corrected additivity rule including interference effects calculation, of positron scattering from pyridine, with dipole rotational excitations accounted for using the Born approximation. Comparisons are made between the experimental measurements and theoretical calculations. For the positronium formation cross section, we also compare with results from a recent empirical model. In general, quite good agreement is seen between the calculations and measurements although some discrepancies remain which may require further investigation. It is hoped that the present study will stimulate development of ab initio level theoretical methods to be applied to this important scattering system.
The interaction in sorbitol-plasticized starch bionanocomposites via positron annihilation lifetime spectroscopy and small angle X-ray scattering
Publisher: Elsevier BV
Date: 05-2012
Modelling single positron tracks in Ar
Publisher: IOP Publishing
Date: 07-02-2012
Recent progress in electron scattering from atoms and molecules
Publisher: AIP Publishing LLC
Date: 2014
DOI: 10.1063/1.4866925
Related Organisations
Related Funding Activities
Discovery Projects - Grant ID: DP190100696
Start Date: 04-2019
End Date: 12-2023
Amount: $510,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0449473
Start Date: 01-2004
End Date: 11-2009
Amount: $500,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE0453256
Start Date: 2003
End Date: 12-2004
Amount: $512,573.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP150101521
Start Date: 2015
End Date: 06-2018
Amount: $355,100.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP0662955
Start Date: 2006
End Date: 06-2009
Amount: $310,000.00
Funder: Australian Research Council
View Funded ActivityLinkage - International - Grant ID: LX0667518
Start Date: 2006
End Date: 12-2008
Amount: $26,000.00
Funder: Australian Research Council
View Funded ActivityARC Centres Of Excellence - Grant ID: CE0561389
Start Date: 07-2005
End Date: 12-2014
Amount: $10,500,000.00
Funder: Australian Research Council
View Funded Activity