Quantum mechanical and crossed beam study of vibrational excitation of N/sub 2/ by electron impact at 30--75 eV. [Differential cross sections, potential scattering model]

Journal Article · Sat Jan 15 04:00:00 EST 1977 · J. Chem. Phys.; (United States)

OSTI ID:7313165

Truhlar, D G; Brandt, M A; Srivastava, S K; Trajmar, S; Chutjian, A

The ratios of differential cross sections for excitation of the first excited vibrational state and for elastic scattering for electron impact on N/sub 2/ have been measured at scattering angles ranging from 20degree to 135degree at 30, 35, 40, 45, and 75 eV impact energies and from 25degree to 90degree scattering angle at 20 eV impact energy. The results at 20 eV are in good agreement with two previous sets of measurements. Using previously measured and normalized elastic differential cross sections for N/sub 2/, the ratios have been converted to inelastic cross sections. Calculations using a four-state vibrational--rotational basis set and an effective interaction potential developed previously are reported at the five energies in the 30--75 eV region. It is shown that the potential scattering model can account for the magnitude and the qualitative behavior of the cross sections at 35--75 eV but there are some significant quantitative differences between theory and experiment. The most striking of these is the way the theoretical model overestimates the scattering at scattering angles less than about 50degree. Core-excited resonances apparently make an appreciable contribution to the vibrationally inelastic scattering at 30 eV. (AIP)

• Research Organization: Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 7313165
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 66:2; 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
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 10-100
EXCITATION
EXCITED STATES
FLUIDS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
POTENTIAL SCATTERING
SCATTERING
VIBRATIONAL STATES