Cross sections for rotationally inelastic scattering of H/sub 2/CO. I. Collisions with polar scattering gases

Journal Article · Sun Feb 01 04:00:00 EST 1987 · J. Chem. Phys.; (United States)

OSTI ID:6813431

van Hulst, N F; ter Meulen, J J; Dymanus, A

Rotationally inelastic cross sections for ..delta..J = 0, +- 1, and +- 2 transitions in the K/sub -1/ = 1 ladder of formaldehyde (H/sub 2/CO) in collision with CF/sub 3/H, CH/sub 3/F, and NH/sub 3/ are measured in a beam-maser double-resonance (BMDR) experiment. The dependence on detection angle and relative collision velocity is investigated. At least 80% of the integral cross sections is probed. A striking difference in the angular dependence of the differential cross section for ..delta..J = 0 and ..delta..J = +- 1 transitions is observed. The cross sections are compared with theoretical predictions in modified Anderson theory and adiabatically corrected sudden approximation. Anderson theory predicts very well the K-doublet cross sections and total inelastic cross sections, but fails to reproduce the state-to-state cross sections for ..delta..Jnot =0 transitions. For ..delta..J = +- 1 and ..delta..J = +- 2 transitions corrected sudden approximation shows a much better agreement both with the cross sections determined in this investigation and with the values from other double-resonance experiments.

• Research Organization: Fysisch Laboratorium, Katholieke Universiteit Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Netherlands
• OSTI ID: 6813431
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 86:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALDEHYDES
AMMONIA
BEAMS
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DOUBLE RESONANCE METHODS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUORINATED ALIPHATIC HYDROCARBONS
FLUOROFORM
FORMALDEHYDE
HALOGENATED ALIPHATIC HYDROCARBONS
HYDRIDES
HYDROGEN COMPOUNDS
METHYL FLUORIDE
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ROTATIONAL STATES
SUDDEN APPROXIMATION