Initial vibrational state dependence of resonant excitation and ''dissociative attachment'' in electron--N/sub 2/ scattering

Journal Article · Thu May 15 04:00:00 EDT 1980 · J. Chem. Phys.; (United States)

OSTI ID:5449050

Huetz, A; Gresteau, F; Hall, R I; Mazeau, J

A beam of vibrationally excited ground state nitrogen molecules has been generated using a microwave discharge. The effect of this vibrational energy on the different decay processes of the A /sup 2/Pi/sub u/ state of N/sup -//sub 2/ formed by electron impact in the 7--13 eV region has been studied using an electron-impact spectrometer. Firstly, the ''boomerang'' oscillations occuring in the excitation cross section of the A /sup 3/..sigma../sup +//sub u/ levels increase in amplitude when the initial level is v=1. This effect, as well as the measured cross sections are well described by calculations using the local complex potential model. Secondly, the cross section ratio for the ''dissociative attachment'', process yielding unstable N/sup -/(/sup 3/P) from the v=0 and 1 levels has been evaluated indicating that the vibrational energy has almost no effect. The calculations further indicate that this ratio only rises to 4 when going from v=0 to 4 which is in sharp contrast to H/sub 2/ where, in the 4 eV region the same amount of vibrational energy increases the dissociative attachment cross section by a factor of 360.

• Research Organization: Groupe de Spectroscopie par Impact Electronique et Ionique, Laboratoire de Physique et Optique Corpusculaires. T.12--E.5, Universite Pierre et Marie Curie, 4, Place Jussieu, 75230 Paris Cedex 05, France.
• OSTI ID: 5449050
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 72:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DISSOCIATION
ELECTRON ATTACHMENT
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 01-10
EXCITATION
EXCITED STATES
FLUIDS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
VIBRATIONAL STATES