Pressure broadening of the HCO/sup +/ J=0--1 transition by hydrogen

Journal Article · Mon Jan 14 23:00:00 EST 1980 · J. Chem. Phys.; (United States)

OSTI ID:5635892

Anderson, T G; Gudeman, C S; Dixon, T A; Woods, R C

Measurements have been made of the broadening of the HCO/sup +/ J=0--1 microwave absorption line by hydrogen. The linewidths (..delta nu.., half-width at half-intensity) were obtained from a nonlinear least squares analysis of the individual spectra, taken over the pressure range of 4--40 mTorr. The pressure dependence of the linewidth, d..delta nu../dP was determined to be 29.6 +- 3 MHz/Torr for the HCO/sup +/ transition broadened by H/sub 2/ near 100 /sup 0/K. This corresponds to a collisional cross section of 182 +- 20 A/sup 2/ for HCO/sup +/--H/sub 2/. Also, a new and more reliable measurement is reported for broadening of the J=7--8 transition of /sup 18/OCS, which gives d..delta nu../dP=7.11 +- 0.15 MHz/Torr for self-broadening at 296 /sup 0/K.

• Research Organization: Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
• OSTI ID: 5635892
• 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
CARBONYL RADICALS
CHARGED PARTICLES
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HYDROGEN
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
LINE BROADENING
LINE WIDTHS
MICROWAVE SPECTRA
MOLECULAR IONS
MOLECULE COLLISIONS
NONMETALS
PRESSURE DEPENDENCE
RADICALS
SPECTRA