Electron-impact dissociation of CH{sup +} ions: Measurement of C{sup +} fragment ions

Journal Article · Wed Oct 01 04:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.042714· OSTI ID:20640340

Bannister, M E; Krause, H F; Vane, C R; Djuric, N; Popovic, D B; Stepanovic, M; Dunn, G H; Chung, Y -S; Smith, A C.H.; Wallbank, B ^[1]

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1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)

Absolute cross sections for electron-impact dissociation of CH{sup +} producing C{sup +} fragment ions were measured in the 3-100 eV range using a crossed electron-ion beams technique with total uncertainties of about 10% near the cross-section peak. Although the measured energy dependence agrees well with two sets of storage ring measurements, the magnitude of the present results lies about 15-25 % below the other results at the cross-section peak near 40 eV. Below 10 eV, the present data tend to exceed the storage ring data, consistent with the presence of excited states in the CH{sup +} ion beam. For energies above 29 eV, the cross sections should also include contributions from dissociative ionization, though no clear onset of this channel is evident in any of the three sets of measured data.

• OSTI ID: 20640340
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 68; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CARBON IONS
CATIONS
CROSS SECTIONS
DISSOCIATION
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
ENERGY DEPENDENCE
EV RANGE
EXCITED STATES
ION BEAMS
IONIZATION
METHANE
STORAGE RINGS