Temperature dependence of the collisional interference in the pure rotational far-infrared spectrum of HD
The far-infrared pure rotational absorption spectrum of HD and HD-/ital X/ mixtures was measured at 77 and 195 K. Specifically, the rotational lines /ital R/(0)--/ital R/(2) were observed for HD-HD, HD-He, HD-Ne, and HD-H/sub 2/ at 77 K and /ital R/(0)--/ital R/(3) for HD-HD, HD-He, and HD-Ar at 195 K. Refined values of the permanent dipole moment of HD are deduced. Collisional interference in the spectrum is characterized by a parameter proportional to the ratio of the average-induced dipole moment to the permanent dipole moment. Its variation with temperature, particularly a change in sign, is not explainable by current theory. The spectral line-shape parameters of width, frequency shift, and asymmetry are determined and their density and temperature behavior discussed with reference to the impact theory of line broadening.
- Research Organization:
- Department of Physics, University of Manitoba, Winnipeg, Manitoba, Canada R3T2N2 (CA)
- OSTI ID:
- 5875333
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 40:2; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ASYMMETRY
BUFFERS
COLLISIONS
DEUTERIDES
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
INFRARED SPECTRA
LINE BROADENING
LOW TEMPERATURE
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NONMETALS
RARE GASES
ROTATIONAL STATES
SPECTRA
SPECTRAL SHIFT
TEMPERATURE DEPENDENCE