Temperature dependence of the collisional interference in the pure rotational far-infrared spectrum of HD

Ulivi, Lorenzo; Lu, Zheng; Tabisz, G. C.

doi:10.1103/physreva.40.642

Cited by 20 publications

(13 citation statements)

References 23 publications

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“…It is obvious from their definitions that the parameters a, b, c,d depend (as do B and S) on both the temperature and on the initial and final states. Such dependence is quite evident in the experimental data on the HD rotational spectrum [5,6]. Our calculations will show that mand J-mixing is crucial in explaining the dependence of these parameters on the initial and final states.…”

Section: Introductionmentioning

confidence: 53%

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Rotational spectrum of HD perturbed by He or Ar gases: The effects of rotationally inelastic collisions on the interference between allowed and collisionally induced components

1992

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The spectral line shapes for the HD rotational spectra perturbed by He and Ar gases, which show interference between allowed and collisionally induced dipole transitions, are calculated including the effects of inelastic rotational collisions. The general parametrization of the line shape, including inelastic collisions, requires six independent real parameters as opposed to four in the theory of Herman, Tipping, and Poll [Phys. Rev. A 20, 2006 (1979)]. Semiclassical calculations based on classical trajectories indicate the importance of the inelastic effects and show qualitative agreement with the experimental parameters. However, it is clear that a fu11 explanation of experimental data will eventua11y require a full quantum treatment.PACS number(s): 32.70.Jz, 32.80. Pj, 34.50.Rk

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Section: Introductionmentioning

confidence: 53%

“…It is clear from Eqs. (4), (5), and (6) that p, and p2 differ from each other in general. The exception occurs either if inelastic collisions are not important, i.e.…”

Section: Introductionmentioning

confidence: 96%

Rotational spectrum of HD perturbed by He or Ar gases: The effects of rotationally inelastic collisions on the interference between allowed and collisionally induced components

1992

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“…The leading anisotropic term in the interaction between a HD molecule and an inert gas atom is of the form P&(cos 8). Only contributions from the anisotropic overlap that are part of the pair-induced dipole moment are found to contribute to the rotational level mixing, and the effect of this mixing on the magnitude of the calculated interference is small [4,26,27].…”

Section: Rotational Level Mixingmentioning

confidence: 93%

“…A theory of the efFect developed by Herman, Tipping, and Poll [5,6] predicts the correct order of magnitude of the interference but is not reliable for a detailed description of the behavior of the intensity with density or of the spectral line shape [4,7,8]. The present study was undertaken with the goal of providing a more general description of the phenomenon.…”

Section: Introductionmentioning

confidence: 96%

“…Considerable experimental data have been gathered on the total intensity and spectral line shape for both the pure rotational and rotation-vibrational spectra [3,4]. A theory of the efFect developed by Herman, Tipping, and Poll [5,6] predicts the correct order of magnitude of the interference but is not reliable for a detailed description of the behavior of the intensity with density or of the spectral line shape [4,7,8].…”

Section: Introductionmentioning

confidence: 99%

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Spectral line shape arising from collisional interference between electric-dipole-allowed and collision-induced transitions

et al. 1991

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A theory is developed to describe the spectral line shape due to interference between electric-dipoleallowed and collision-induced transitions in pure rotational molecular spectra. Motivation was provided by experimental data available for HD-inert gas systems. This theory is based on a master-equation approach to induced spectra employed by Alber and Cooper [Phys. Rev. A 33, 3084 (1986)]. The active molecule is considered to be immersed in a bath of perturbers. An expression for the absorption coeKcient is obtained within the binary collision approximation that contains terms due to allowed, induced, and interference contributions. Effects due to m mixing, J mixing, and successive collisions are included. Low-order approximations of the theory eventually reduce to results of earlier efforts, namely, the pioneering description of collisional interference by Herman, Tipping, and Poll [Phys. Rev A 20, 2006 (1979)] and refinements to it through consideration of rotational level mixing. The principal attribute of this approach is the treatment of allowed and collision-induced transitions in a consistent manner.

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Interference of Allowed and Collision-Induced Transitions in HD: Experiment

Ulivi¹,

Tabisz

1995

Collision- And Interaction-Induced Spectroscopy

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Temperature dependence of the collisional interference in the pure rotational far-infrared spectrum of HD

Cited by 20 publications

References 23 publications

Rotational spectrum of HD perturbed by He or Ar gases: The effects of rotationally inelastic collisions on the interference between allowed and collisionally induced components

Rotational spectrum of HD perturbed by He or Ar gases: The effects of rotationally inelastic collisions on the interference between allowed and collisionally induced components

Spectral line shape arising from collisional interference between electric-dipole-allowed and collision-induced transitions

Interference of Allowed and Collision-Induced Transitions in HD: Experiment

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