Beam maser investigation of inelastic scattering of NH/sub 3/. III. Cross sections for rotational transitions induced by CO/sub 2/, N/sub 2/, and H/sub 2/

Journal Article · Sat Jan 15 00:00:00 EST 1983 · J. Chem. Phys.; (United States)

OSTI ID:6525982

Klaassen, D B.M.; ter Meulen, J J; Dymanus, A

Cross sections for rotational transitions between various low-lying inversion doublets of NH/sub 3/ in collisions with CO/sub 2/, N/sub 2/, and H/sub 2/ are measured in a double-resonance beam maser setup. A modification of Anderson's theory (D. B. M. Klaassen, J. J. ter Meulen, and A. Dymanus, J. Chem. Phys. 77, 4972 (1982)) yields values for the cross sections that are in good agreement with the experimental results for CO/sub 2/ and N/sub 2/. For the system NH/sub 3/--H/sub 2/, transition probabilities are evaluated in Anderson's theory using ''bent'' trajectories. Induction and dispersion terms up to R/sup -7/ are considered in the long-range intermolecular potential. For the short-range repulsive part, two empirical potentials are proposed with parameters that are fitted to the experimental results. Integral cross sections for rotational transitions calculated with these potentials are also presented.

• Research Organization: Fysisch Laboratorium, Katholieke Universiteit, Toernooiveld, 6525 ED Nijmegen, The Netherlands
• OSTI ID: 6525982
• Journal Information: J. Chem. Phys.; (United States), Vol. 78:2
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMMONIA
MOLECULE-MOLECULE COLLISIONS
CARBON DIOXIDE
HYDROGEN
NITROGEN
CROSS SECTIONS
ENERGY-LEVEL TRANSITIONS
LASER RADIATION
ROTATIONAL STATES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDRIDES
HYDROGEN COMPOUNDS
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena