State-resolved collision energy dependence of Penning ionization cross sections for N sub 2 and CO sub 2 by He*2 sup 3 S
- Department of Chemistry, College of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153, (Japan)
- Faculty of Liberal Arts, Shizuoka University, 836 Oya, Shizuoka 422, (Japan)
The state-resolved collision-energy dependences of Penning ionization cross sections {sigma}({ital E}) were measured in an energy range (60{lt}{ital E}{lt}400 meV) for N{sub 2} and CO{sub 2} with He*2{sup 3}{ital S} by using a very high-intensity He* beam (1.8{times}10{sup 15} s{sup {minus}1} sr{sup {minus}1}) and detecting energy-analyzed electrons as functions of time-of-flight of He*. The partial ionization cross sections for {Pi} states (N{sup +}{sub 2}{ital B}:{ital A}{sup 2}{Pi}{sub {ital u}}, CO{sup +}{sub 2}{ital B}:{ital X}{sup 2}{Pi}{sub {ital g}}, {ital A}{sup 2}{Pi}{sub {ital u}}) were observed to increase more rapidly with the increase of the collision energy than those for {Sigma} states (N{sup +}{sub 2}{ital B}:{ital X}{sup 2}{Sigma}{sup +}{sub {ital g}}, {ital B}{sup 2}{Sigma}{sup +}{sub {ital u}}, CO{sup +}{sub 2}{ital B}:{ital B}{sup 2}{Sigma}{sup +}{sub {ital u}},{ital C}{sup 2}{Sigma}{sup +}{sub {ital g}}). In the studied energy range, the repulsive walls for end-on collisions were indicated to be harder than those for side-on collisions. The directional peculiarity of the potential surfaces was related to the anisotropy in the hybridization of He* orbitals interacting with the target molecules.
- OSTI ID:
- 5755216
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 94:4; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
ATOMIC BEAMS
BEAMS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
EV RANGE
FLUIDS
GASES
HELIUM
IONIZATION
MILLI EV RANGE
MOLECULE COLLISIONS
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PENNING EFFECT
RARE GASES
TIME-OF-FLIGHT METHOD