Fragmentation of CH/sub 4/ in collisions with fast highly charged ions

Journal Article · Tue Dec 01 04:00:00 EST 1987 · J. Chem. Phys.; (United States)

OSTI ID:5926144

Malhi, N B; Ben-Itzhak, I; Gray, T J; Legg, J C; Needham, V; Carnes, K; McGuire, J H

Measurements of the production cross sections for singly charged molecular ions by high energy (1 MeV/amu) F/sup q//sup +/ (q = 4,6--9), Si/sup q//sup +/ (q = 5,6,8--12), and C/sup q//sup +/ (q = 3--6) projectiles incident on a CH/sub 4/ target are reported. Similar measurements for singly charged recoil ions are presented for H/sup +/ (E = 1--11 MeV) projectiles incident on CH/sub 4/. We observed good agreement between our proton results and earlier electron measurements. Theoretical calculations for the sum of the cross sections for production of all singly ionized CH/sub n/ fragments from CH/sub 4/ are presented using the Born and Glauber approximations, and both calculated cross sections are in reasonable agreement with the measured cross sections. Production of CH/sup +//sub 3/, CH/sup +//sub 2/, CH/sup +/, and C/sup +/ fragments is analyzed both as a function of projectile charge and projectile velocity. Deviation from quasiequilibrium theory is observed in the relatively small cross section ratios of C/sup +/ and CH/sup +/ to CH/sup +//sub 4/ as a function of projectile charge.

• Research Organization: James R. MacDonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506
• OSTI ID: 5926144
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 87:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKANES
ATOMIC IONS
BEAMS
CARBON IONS
CHARGED PARTICLES
COLLISIONS
DISSOCIATION
FLUORINE IONS
FRAGMENTATION
HEAVY IONS
HYDROCARBONS
ION BEAMS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONIZATION
IONS
METHANE
MOLECULE COLLISIONS
MULTICHARGED IONS
ORGANIC COMPOUNDS
SILICON IONS