Collisional energy dependence of molecular ionization by metastable rare gas atoms

Journal Article · Thu Mar 01 04:00:00 EST 1979 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.437779· OSTI ID:6268433

Martin, R M; Parr, T P

The collisional energy dependence of several molecular total ionization cross sections by metastable rare gas atoms was studied over the thermal energy region using the crossed molecular beam time-of-flight method. Results are reported for the collision systems He, Ne, and Ar ionizing the geometric isomers cis- and trans-dichloroethylene and ortho- and para-dichlorobenzene. The He ionization cross sections oscillate about an energy dependence of E/sup -1/2/ over the energy range 0.004--1.0 eV, and the Ar*+para-dichlorobenzene cross section oscillates about an energy dependence of E/sup -2/5/ over the energy range 0.011--0.64 eV. The remaining systems are characterized by ''bent'' E/sup -m/ dependences with m values of 0.56--0.70 at low energies changing to 0.07--0.29 at higher energies. Comparison with the slopes of the He* systems and the Ar*+para-dichlorobenzene system shows that the ''bent'' and ''oscillating'' energy dependences are similar except for the form of the cross section functions at the lowest energies. No systematic differences are found between the cross section energy dependences for ionization of different geometric isomers or for ionization by the different metastable rare gas atoms.

• Research Organization: Department of Chemistry, University of California, Santa Barbara, California 93106
• OSTI ID: 6268433
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 70:5; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
AROMATICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CHLORINATED AROMATIC HYDROCARBONS
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DATA
DATA FORMS
ELEMENTS
ENERGY DEPENDENCE
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GRAPHS
HALOGENATED AROMATIC HYDROCARBONS
HELIUM
INFORMATION
IONIZATION
ISOMERS
METASTABLE STATES
MILLI EV RANGE
MOLECULE COLLISIONS
NEON
NONMETALS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RARE GASES
TIME-OF-FLIGHT METHOD
TOTAL CROSS SECTIONS