ORCID Profile
0000-0002-4306-1669
Current Organisation
Griffith University
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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.
Atomic and Molecular Physics | Atomic, Molecular, Nuclear, Particle and Plasma Physics | Lasers and Quantum Electronics | Plasma Physics; Fusion Plasmas; Electrical Discharges | Atomic molecular and optical physics | Optical Physics | Structural Chemistry and Spectroscopy | Lasers and quantum electronics | Atomic and molecular physics | Optical Physics not elsewhere classified | Nonlinear optics and spectroscopy
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in Technology | Scientific Instruments |
Publisher: IEEE
Date: 08-2011
Publisher: American Physical Society (APS)
Date: 29-09-2005
Publisher: IEEE
Date: 06-2013
Publisher: American Physical Society (APS)
Date: 05-05-2011
Publisher: IOP Publishing
Date: 24-01-2008
Publisher: Elsevier BV
Date: 07-2001
Publisher: American Physical Society (APS)
Date: 18-03-2014
Publisher: IOP Publishing
Date: 22-02-2013
Publisher: IOP Publishing
Date: 23-08-2006
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: Springer Science and Business Media LLC
Date: 28-08-2015
DOI: 10.1038/SREP13527
Abstract: When a diatomic molecule is ionized by an intense laser field, the ionization rate depends very strongly on the inter-nuclear separation. That dependence exhibits a pronounced maximum at the inter-nuclear separation known as the “critical distance”. This phenomenon was first demonstrated theoretically in H 2 + and became known as “charge-resonance enhanced ionization” (CREI, in reference to a proposed physical mechanism) or simply “enhanced ionization”(EI). All theoretical models of this phenomenon predict a double-peak structure in the R-dependent ionization rate of H 2 + . However, such double-peak structure has never been observed experimentally. It was even suggested that it is impossible to observe due to fast motion of the nuclear wavepackets. Here we report a few-cycle pump-probe experiment which clearly resolves that elusive double-peak structure. In the experiment, an expanding H 2 + ion produced by an intense pump pulse is probed by a much weaker probe pulse. The predicted double-peak structure is clearly seen in delay-dependent kinetic energy spectra of protons when pump and probe pulses are polarized parallel to each other. No structure is seen when the probe is polarized perpendicular to the pump.
Publisher: The Optical Society
Date: 15-09-2011
DOI: 10.1364/OL.36.003660
Publisher: American Physical Society (APS)
Date: 29-08-2003
Publisher: American Physical Society (APS)
Date: 22-05-2013
Publisher: American Physical Society (APS)
Date: 02-08-2011
Publisher: American Physical Society (APS)
Date: 05-10-2009
Publisher: American Physical Society (APS)
Date: 12-10-2005
Publisher: American Physical Society (APS)
Date: 11-10-2005
Publisher: IOP Publishing
Date: 08-10-2014
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: IEEE
Date: 08-2011
Publisher: American Physical Society (APS)
Date: 19-01-2005
Publisher: Elsevier BV
Date: 07-2021
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: IOP Publishing
Date: 05-04-2006
Publisher: American Physical Society (APS)
Date: 27-01-2005
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: Elsevier BV
Date: 07-2001
Publisher: American Physical Society (APS)
Date: 24-11-2009
Publisher: IOP Publishing
Date: 03-08-2020
Abstract: The debate on tunnelling times have always been full of contradictions and the attoclock experiments that measure tunnelling delays in strong-field ionization are no exception. The current review presents the debate and discussions concerning the studies of tunnelling times based only on the attoclock technique. We review them with their implications and pitfalls identified due to lack of accurate strong field models that validate the observations in interpreting the measurements performed on noble gases. In order to provide a complete picture, the review begins with a background on some of the popular tunnelling time definitions, most of them conceived during the late 1980s debate, which are often cited in the attoclock literature. We then discuss various attoclock experiments on noble gas atoms and their interpretations in context of the tunneling time debate. The recently performed attoclock experiment and numerical modelling using atomic hydrogen are also presented as an attempt at resolving the controversy. We conclude with the current status of the debate.
Publisher: American Physical Society (APS)
Date: 17-04-2014
Publisher: IOP Publishing
Date: 18-04-2018
Publisher: American Physical Society (APS)
Date: 23-11-2005
Publisher: American Association for the Advancement of Science (AAAS)
Date: 2022
Abstract: High-harmonic spectroscopy can access structural and dynamical information on molecular systems encoded in the litude and phase of high-harmonic generation (HHG) signals. However, measurement of the harmonic phase is a daunting task. Here, we present a precise measurement of HHG phase difference between two isotopes of molecular hydrogen using the advanced extreme-ultraviolet (XUV) Gouy phase interferometer. The measured phase difference is about 200 mrad, corresponding to ~3 attoseconds ( 1 as = 10 − 18 s ) time delay which is nearly independent of harmonic order. The measurements agree very well with numerical calculations of a four-dimensional time-dependent Schödinger equation. Numerical simulations also reveal the effects of molecular orientation and intramolecular two-center interference on the measured phase difference. This technique opens a new avenue for measuring the phase of harmonic emission for different atoms and molecules. Together with isomeric or isotopic comparisons, it also enables the observation of subtle effects of molecular structures and nuclear motion on electron dynamics in strong laser fields.
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: Elsevier BV
Date: 11-2000
Publisher: American Physical Society (APS)
Date: 25-08-2003
Publisher: American Physical Society (APS)
Date: 14-07-2010
Publisher: Springer New York
Date: 2008
Publisher: IOP Publishing
Date: 11-06-2021
Publisher: Elsevier BV
Date: 2001
Publisher: American Physical Society (APS)
Date: 19-05-2008
Publisher: American Physical Society (APS)
Date: 20-11-2006
Publisher: American Physical Society (APS)
Date: 15-04-2014
Publisher: IOP Publishing
Date: 22-06-2006
Publisher: Elsevier BV
Date: 02-2000
Publisher: American Physical Society (APS)
Date: 23-11-2004
Publisher: American Physical Society (APS)
Date: 27-01-2011
Publisher: IOP Publishing
Date: 07-08-2008
Publisher: American Physical Society (APS)
Date: 19-12-2008
Publisher: American Physical Society (APS)
Date: 26-12-2012
Publisher: American Physical Society (APS)
Date: 17-03-2009
Publisher: American Physical Society (APS)
Date: 14-01-2010
Publisher: American Physical Society (APS)
Date: 31-01-2011
Publisher: American Physical Society (APS)
Date: 09-04-2008
Publisher: IOP Publishing
Date: 21-11-2017
Publisher: IOP Publishing
Date: 30-05-2014
Publisher: IOP Publishing
Date: 20-01-2004
Publisher: IOP Publishing
Date: 29-06-2020
Publisher: Elsevier BV
Date: 02-2023
Publisher: American Physical Society (APS)
Date: 11-03-2005
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: American Physical Society (APS)
Date: 18-03-2009
Publisher: AIP Publishing
Date: 08-2020
DOI: 10.1063/5.0011508
Abstract: Measurements to control the morphology and characteristics of a picosecond laser produced chromium plasma plume upon double-pulse (DP) irradiation are presented and compared to their single-pulse (SP) counterpart. DP schemes are implemented by employing two geometries where the inter-pulse delay and the spatial separation are the control parameters. The ratio of plume length to plume width decreases upon increasing the inter-pulse delay and/or the energy of the second pulse in the collinear DP scheme. Interestingly, plasmas generated in the DP scheme at lower pressures resemble the expansion features of the plasma generated in the SP scheme at higher pressures. We find that DP schemes are advantageous for applications such as high harmonic generation and the production of quality thin films.
Publisher: IEEE
Date: 08-2011
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: IOP Publishing
Date: 23-11-2009
Publisher: American Physical Society (APS)
Date: 10-06-2003
Publisher: Proceedings of the National Academy of Sciences
Date: 12-11-1996
Abstract: A protein fluorescence probe system, coupling excited-state intermolecular Förster energy transfer and intramolecular proton transfer (PT), is presented. As an energy donor for this system, we used tryptophan, which transfers its excitation energy to 3-hydroxyflavone (3-HF) as a flavonol prototype, an acceptor exhibiting excited-state intramolecular PT. We demonstrate such a coupling in human serum albumin–3-HF complexes, excited via the single intrinsic tryptophan (Trp-214). Besides the PT tautomer fluorescence (λ max = 526 nm), these protein–probe complexes exhibit a 3-HF anion emission (λ max = 500 nm). Analysis of spectroscopic data leads to the conclusion that two binding sites are involved in the human serum albumin–3-HF interaction. The 3-HF molecule bound in the higher affinity binding site, located in the IIIA subdomain, has the association constant ( k 1 ) of 7.2 × 10 5 M −1 and predominantly exists as an anion. The lower affinity site ( k 2 = 2.5 × 10 5 M −1 ), situated in the IIA subdomain, is occupied by the neutral form of 3-HF (normal tautomer). Since Trp-214 is situated in the immediate vicinity of the 3-HF normal tautomer bound in the IIA subdomain, the intermolecular energy transfer for this donor/acceptor pair has a 100% efficiency and is followed by the PT tautomer fluorescence. Intermolecular energy transfer from the Trp-214 to the 3-HF anion bound in the IIIA subdomain is less efficient and has the rate of 1.61 × 10 8 s −1 , thus giving for the donor/acceptor distance a value of 25.5 Å.
Publisher: American Physical Society (APS)
Date: 08-10-2010
Publisher: American Physical Society (APS)
Date: 10-10-2011
Publisher: IEEE
Date: 06-2013
Publisher: IOP Publishing
Date: 04-03-2013
Publisher: IOP Publishing
Date: 16-12-2015
Location: Russian Federation
Start Date: 11-2014
End Date: 11-2016
Amount: $240,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2023
End Date: 12-2025
Amount: $532,842.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2011
End Date: 12-2015
Amount: $230,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2019
End Date: 06-2024
Amount: $435,449.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2020
End Date: 12-2022
Amount: $744,000.00
Funder: Australian Research Council
View Funded Activity