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Hoang, T. F.; Chew, C. K.; Phua, K. K.

doi:10.1103/physrevd.20.692

Cited by 8 publications

(5 citation statements)

References 30 publications

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“…In a more common case of atmospheric gases where their mass differ not more than by factor of two, the discrepancies will be below 0.2%. Discussion presented in this appendix is also related to earlier work by Hoang et al, 58 where properties of the relaxation times ratio τ v /τ v , called therein the memory parameter, for mixtures were investigated. They showed nonlinearity of the τ v /τ v ratio with fractional concentration of the mixture.…”

Section: Discussionmentioning

confidence: 71%

Velocity-changing collisions in pure H2 and H2-Ar mixture

Wcisło

Tran

Kassi

et al. 2014

The Journal of Chemical Physics

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We show how to effectively introduce a proper description of the velocity-changing collisions into the model of isolated molecular transition for the case of self-and Ar-perturbed H 2 . We demonstrate that the billiardball (BB) approximation of the H 2 -H 2 and H 2 -Ar potentials gives an accurate description of the velocitychanging collisions. The BB model results are compared with ab initio classical molecular dynamics simulations (CMDS). It is shown that the BB model correctly reproduces not only the principal properties such as frequencies of velocity-changing collisions or collision kernels, but also other characteristics of H 2 -H 2 and H 2 -Ar gas kinetics like rate of speed-changing collisions. Finally, we present line-shape measurement of Q (1) line of the first overtone band of self-perturbed H 2 . We quantify the systematic errors of line-shape analysis caused by the use of oversimplified description of velocity-changing collisions. These conclusions will have significant impact on recent rapidly developing ultra-accurate metrology based on Doppler-limited spectroscopic measurements like Doppler-width thermometry, atmosphere monitoring, Boltzmann constant determination or transition position and intensity determination for fundamental studies.

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Section: Discussionmentioning

confidence: 71%

Velocity-changing collisions in pure H2 and H2-Ar mixture

Wcisło

Tran

Kassi

et al. 2014

The Journal of Chemical Physics

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“…[9] Thermal properties of materials in general rest on the phonon dispersions. While electronic and related properties of PbTe has been rather extensively studied using first principles methods, [10,11,12,13,14] the phonon dispersions have not been reported. The purpose of this paper is to report these dispersions, as obtained within density functional theory.…”

Section: Introductionmentioning

confidence: 99%

Ab initio phonon dispersions for PbTe

Subedi

Singh

2008

Solid State Communications

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We report first principles calculations of the phonon dispersions of PbTe both for its observed structure and under compression. At the experimental lattice parameter we find a near instability of the optic branch at the zone center, in accord with experimental observations. This hardens quickly towards the zone boundary. There is also a very strong volume dependence of this mode, which is rapidly driven away from an instability by compression. These results are discussed in relation to the thermal conductivity of the material.

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“…that here we are dealing with two asymmetric fireballs, one moving in the forward and the other in the backward direction of the c.m.s~, and that the numbers of mesons emitted by the two fireballs are different, .as has been investigated previously [23]. The ratios F/B of forward and backward mesons produced by TI+P collisions have been estimated as in [23] and the results are summarized in Table II; the errors '\-6% are omitted for simplicity.…”

mentioning

confidence: 86%

“…To estimate the fireball radius from the HBT ~ffect, both groups have used the decoherence factor as a free parameter and approximated the Bessel function by a series expansion. They arrive at the following expression: ( 23) where we have used R' to denote the radius thus estimated, whereas.R is kept for the value obtained using (2), i.e. the decoherence factor set to unity.…”

Section: Fireballs From Nuclear Reactionsmentioning

confidence: 99%