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Alghazi, Abai; Liu, Jing; Dai, Kang; Shen, Yifan

doi:10.1016/j.chemphys.2014.12.012

Cited by 6 publications

(3 citation statements)

References 33 publications

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“…23 of ALDS. 12 The three distinct phases of vibrational energy loss from CsD are now clearly apparent in the T v plot. However, it is evident that in the initial phase, T v for CsD (27;10) in D 2 falls more slowly than was found for CsH(21;10) shown in Fig.…”

Section: Near-resonant V-v Transfer: Csd In Dmentioning

confidence: 89%

“…The computational model of state-to-state energy transfer in large gas ensembles, developed by the author and coworkers, has been used to track the dispersal of excess energy in gas ensembles consisting of highly vibrationally excited CsH in H 2 and CsD in D 2 at 500 K. Recent experiments by Alghazi et al 12 on these multi-collisional ensembles incorporate both spectroscopic-and time-resolution, allowing the modal temperatures of vibration, rotation, and translation to be determined as a function of pump-probe time delay on the µs time scale. These results provide a test of the computational model and its ability to reproduce the experimental data obtained on caesium hydrides.…”

Section: Discussionmentioning

confidence: 99%

“…This situation has changed however following the experimental work of Alghazi, Liu, Dai, and Shen (ALDS). 12 These authors have developed a pump-probe, laser-spectroscopic, technique that achieves simultaneous time discrimination and spectroscopic-resolution. Thus the rovibrational state populations of the initially excited, diatomic molecules may be determined as a function of pump-probe time delay.…”

Section: Introductionmentioning

confidence: 99%

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Quantum state-resolved, bulk gas energetics: Comparison of theory and experiment

McCaffery

2016

The Journal of Chemical Physics

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Until very recently, the computational model of state-to-state energy transfer in large gas mixtures, introduced by the author and co-workers, has had little experimental data with which to assess the accuracy of its predictions. In a novel experiment, Alghazi et al. [Chem. Phys. 448, 76 (2015)] followed the equilibration of highly vibrationally excited CsH(D) in baths of H 2 (D 2 ) with simultaneous time-and quantum state-resolution. Modal temperatures of vibration, rotation, and translation for CsH(D) were obtained and presented as a function of pump-probe delay time. Here the data from this study are used as a test of the accuracy of the computational method, and in addition, the consequent changes in bath gas modal temperatures, not obtainable in the experiment, are predicted. Despite large discrepancies between initial CsH(D) vibrational states in the experiment and those available using the computational model, the quality of agreement is sufficient to conclude that the model's predictions constitute at least a very good representation of the overall equilibration that, for some measurements, is very accurate. Published by AIP Publishing. [http://dx

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Section: Near-resonant V-v Transfer: Csd In Dmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantum state-resolved, bulk gas energetics: Comparison of theory and experiment

McCaffery

2016

The Journal of Chemical Physics

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Nascent rotational distribution for LiH(v= 0-3,J) states from collisions with H2(E= 4300 and 4800cm-1)

Shen

Wang

Dai

et al. 2017

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Post-recombination early Universe cooling by translation–internal inter-conversion: The role of minor constituents

McCaffery

2015

The Journal of Chemical Physics

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Little is known of the mechanism by which H and H2, the principal constituents of the post-re-combination early Universe, cooled sufficiently to permit cluster formation, nucleosynthesis, and, eventually, the formation of structured objects. Radiative decay primarily cools the internal modes of H2, as Δj = - 2 jumps accompany quadrupolar emission. This, however, would be a self-limiting mechanism. In this work, a translational energy cooling mechanism based on collision-induced, translation-to-internal mode conversion, is extended, following an earlier study [A. J. McCaffery and R. J. Marsh, J. Chem. Phys. 139, 234310 (2013)] of ensembles comprising H2 in a H atom bath gas. Here, the possible influence of minor species, such as HD, on this cooling mechanism is investigated. Results suggest that the influence of HD is small but not insignificant. Conversion is very rapid and an overall translation-to-internal energy conversion efficiency of some 5% could be expected. This finding may be of use in the further development of models of this complex phase of early Universe evolution. An unexpected finding in this study was that H2 + HD ensembles are capable of very rapid translation-to-internal conversion with efficiencies of >40% and relaxation rates that appear to be relatively slow. This may have potential as an energy storage mechanism.

show abstract

Quantum state-resolved energy redistribution of highly vibrationally excited CsH(D) by collisions withH2(D2)

Cited by 6 publications

References 33 publications

Quantum state-resolved, bulk gas energetics: Comparison of theory and experiment

Quantum state-resolved, bulk gas energetics: Comparison of theory and experiment

Nascent rotational distribution for LiH(v= 0-3,J) states from collisions with H2(E= 4300 and 4800cm-1)

Post-recombination early Universe cooling by translation–internal inter-conversion: The role of minor constituents

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