Collision-induced polarized and depolarized Raman spectra of helium and the diatom polarizability

Journal Article · Tue Jan 15 04:00:00 EST 1980 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.439202· OSTI ID:5756611

Proffitt, M H; Frommhold, L

The spectral distributions and absolute intensities of collision-induced Raman spectra of helium are obtained at 30 amagat, with incident beam polarizations parallel and perpendicular to the observation. These spectra can readily be separated into the polarized and the depolarized Raman continuum of the helium diatom. For comparison, spectra are also computed from wave mechanics, on the basis of Placzeck's polarizability theory. Accurate, semiempirical interaction potentials are used as input, together with ab initio computations of the helium diatom polarizability tensor components. The computed spectra of selected trace and anisotropy functions agree with the observed polarized and depolarized continua. Anisotropy functions consistent with the depolarized spectrum differ by less than 5% from the classical dipole-induced dipole (DID) values at 2.685 A separation.

• Research Organization: Physics Department and Electronics Research Center, University of Texas at Austin, Texas 78712
• OSTI ID: 5756611
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 72:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CRYOGENIC FLUIDS
DIMERS
ELECTRICAL PROPERTIES
ELEMENTS
FLUIDS
HELIUM
MOLECULES
NONMETALS
PHYSICAL PROPERTIES
POLARIZABILITY
POLARIZATION
RAMAN SPECTRA
RARE GASES
SPECTRA