Measurements of electron detachment cross sections in 10-50 keV impact energy H{sup {minus}} + collisions

Journal Article · Wed May 01 04:00:00 EDT 1996 · Bulletin of the American Physical Society

OSTI ID:394327

Seely, D G ^[1]; Sen, A; Kvale, T J ^[2]

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1. Albion College, MI (United States)
2. Univ. of Toledo, OH (United States)

Absolute cross sections for the single- and double-electron detachment ({sigma}{sub {minus}10} and {sigma}{sub {minus}11}, respectively) in collisions between H{sup {minus}} and methane have been measured in the energy range of 10-50 keV. A well-collimated H{sup {minus}} ion beam was accelerated into a gas target cell containing methane and the scattered H{sup {minus},0,+} beam components of the collision products were magnetically separated and simultaneously measured by separate detectors. The cross sections were determined by quadratic least squares fits of the scattered-beam growth curves. In the present energy region, {sigma}{sub {minus}10} exhibits a maximum at around 20 keV impact energy and then monotonically decreases with increasing impact energy. However, {sigma}{sub {minus}11} displays a different energy dependence by monotonically increasing with increasing impact energy until about 25 keV and thereafter remaining relatively constant.

• OSTI ID: 394327
• Report Number(s): CONF-9605105--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
ELECTRON DETACHMENT
HYDROGEN IONS 1 MINUS
ION-MOLECULE COLLISIONS
KEV RANGE 10-100
METHANE