Absolute total and one- and two-electron transfer cross sections for Ar[sup [ital q]+] (8[le][ital q][le]16) on He and H[sub 2] at 2. 3[ital q] keV

Journal Article · Sat May 01 04:00:00 EDT 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.47.3758· OSTI ID:6609705

Vancura, J; Marchetti, V J; Perotti, J J; Kostroun, V O ^[1]

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1. Nuclear Science and Engineering Program, Ward Laboratory, Cornell University, Ithaca, New York 14853 (United States)

Absolute values for the total and one- and two-electron transfer cross sections for Ar[sup [ital q]+] ions (8[le][ital q][le]16) colliding with helium and molecular hydrogen at 2.3[ital q] keV laboratory energy were measured by the growth-rate method. The He and H[sub 2] total cross sections as a function of Ar-projectile [ital L]-shell occupation number increase monotonically from Ar[sup 8+], 2[ital p] shell full, to Ar[sup 16+], 2[ital s] shell empty. The H[sub 2] one-electron capture cross section scales approximately as [[ital E][sub IP] (He)/[ital E][sub IP](H[sub 2])][sup 2] times the corresponding He cross section, but the shapes of the two cross sections differ in detail. The Ar[sup [ital q]+] ions were produced by the Cornell superconducting-solenoid, cryogenic electron-beam ion source (CEBIS) and extracted at 2.3 kV. Selected charge states traversed a gas cell, after which they were detected and charge-state analyzed by the energy-retardation method and by a [pi]/ [radical]2 cylindrical electrostatic analyzer. The target-gas pressure in the cell was measured directly by the orifice-flow method used for absolute-pressure gauge calibration. The overall error in the Ar[sup [ital q]+] on H[sub 2] cross-section measurements is [plus minus]10%, and [plus minus]15% in the He measurements.

• DOE Contract Number: FG02-86ER13519
• OSTI ID: 6609705
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 47:5; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON TRANSFER
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
HELIUM
HYDROGEN
ION COLLISIONS
ION-ATOM COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
MANY-BODY PROBLEM
MOLECULE COLLISIONS
MULTICHARGED IONS
NONMETALS
RARE GASES
TOTAL CROSS SECTIONS
TWO-BODY PROBLEM