Experimental and theoretical investigation of the far-infrared spectrum of H/sub 2/-He mixtures

Journal Article · Thu Oct 15 04:00:00 EDT 1987 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.36.3729· OSTI ID:6173810

Birnbaum, G; Bachet, G; Frommhold, L

New measurements of the rototranslational collision-induced absorption spectra in the far-infrared (FIR) frequency region of gaseous mixtures of hydrogen (H/sub 2/) and helium (He) are reported. The frequency range extends up to 1500 cm/sup -1/ at the temperature of 195 K, and 1700 cm/sup -1/ at 296 K. The uncertainties of the measurement are assessed. Comparison with previous measurements show substantial agreement at frequencies where the measurements overlap. For comparison with the measurement, spectra are computed from the fundamental theory using a state of the art ab initio dipole function and an isotropic potential surface as input. The observed agreement suggests that for important applications, such as the analysis of the FIR spectra of the outer planets, the spectra can be obtained reliably as a function of frequency and temperature from quantum calculations of the kind presented here.

• Research Organization: National Bureau of Standards, Gaithersburg, Maryland 20899
• OSTI ID: 6173810
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 36:8; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ATMOSPHERES
BINARY MIXTURES
CALCULATION METHODS
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FAR INFRARED RADIATION
FLUIDS
GASES
HELIUM
HYDROGEN
INFRARED RADIATION
INFRARED SPECTRA
LOW TEMPERATURE
MEASURING METHODS
MEDIUM TEMPERATURE
MIXTURES
NONMETALS
PLANETARY ATMOSPHERES
PRESSURE DEPENDENCE
RADIATIONS
RARE GASES
ROTATIONAL STATES
SPECTRA