Electron-impact excitation of the singlet states of N/sub 2/. I. The Birge--Hopfield system (b/sup 1/. pi. /sub u/--X/sup 1/. sigma. /sup +//sub g/)

Journal Article · Tue Jul 15 00:00:00 EDT 1980 · J. Chem. Phys.; (United States)

OSTI ID:5335970

Zipf, E C; Gorman, M R

The absolute emission cross sections for the excitation of the Birge--Hopfield bands (b/sup 1/..pi../sub u/--X/sup 1/..sigma../sup +//sub g/) by electron impact on N/sub 2/ from threshold to 500 eV are reported. With the exception of the v'=1, 5, and 6 vibrational levels, all other b/sup 1/..pi../sub u/ levels are found to predissociate with a specific predissociation branching ratio, >0.99. This forbidden process is a major source of the nitrogen atoms produced by electron-impact dissociation of N/sub 2/. Quite remarkably, the b/sup 1/..pi../sub u/ (v'=1) state is only slightly predissociated (<10%). The emission cross section for the v'=1 level has a maximum value of 2.3 x 10/sup -18/ cm/sup 2/ at 35 eV. The absolute transition probabilities, emission cross sections, and the variation of the electric dipole moment with internuclear distance for 21 BH (1, v') bands are given.

• Research Organization: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
• OSTI ID: 5335970
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 73:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular &amp; Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CRYOGENIC FLUIDS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
EMISSION SPECTRA
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 10-100
EXCITATION
FLUIDS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
SPECTRA