Theory of collision-induced translation-rotation spectra: H/sub 2/-He

Journal Article · Wed Feb 01 04:00:00 EST 1984 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.29.595· OSTI ID:6587716

Birnbaum, G; Chu, S; Dalgarno, A; Frommhold, L; Wright, E L

An adiabatic quantal theory of spectral line shapes in collision-induced absorption and emission is presented which incorporates the induced translation-rotation and translation-vibration spectra. The generalization to account for the anisotropy of the scattering potential is given. Calculations are carried out of the collision-induced absorption spectra of He in collisions with H/sub 2/ with ab initio electric dipole functions and realistic potentials. The anisotropy of the interaction potential is small and is not included in the calculations. The predicted spectra are in satisfactory agreement with experimental data though some deviations occur which may be significant. The rotational line shapes have exponential wings and are not Lorentzian. The connection between the quantal and classical theories is written out explicitly for the isotropic overlap induction.

• Research Organization: National Bureau of Standards, Washington, DC 20234
• OSTI ID: 6587716
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 29:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ATMOSPHERES
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
DIPOLES
ELEMENTS
EMISSION
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
FLUIDS
GASES
HELIUM
HYDROGEN
MOLECULE COLLISIONS
MULTIPOLES
NONMETALS
PHOTON EMISSION
PLANETARY ATMOSPHERES
RARE GASES
ROTATIONAL STATES
VIBRATIONAL STATES