Cross sections for K-shell excitation in slow ion--atom collisions

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.19.55· OSTI ID:6197541

Schneider, D; Stolterfoht, N

Absolute cross sections for K-shell excitation in projectile ions and target gas atoms are derived from measurements of Auger-electron production in various heavy-ion--atom collisions. Atomic numbers Z/sub H/ and Z/sub L/ for, respectively, the heavier and lighter collision partner were chosen between 5 and 10 with ..delta..Z = Z/sub H/-Z/sub L/ ranging from 0 to 4. The projectile energy was varied from 40 to 600 keV. The cross sections are compared with previous theoretical data. In general, good agreement is found between theory and experiment at the low-energy limit. At higher energies, increasing deviations are observed due to the increasing vacancy occupation of the 2p..pi..-molecular orbital. For most collision systems, K-vacancy sharing ratios are derived in excellent accord with theoretical results in the whole energy range. However, for light-collision systems (Z/sub H/ + Z/sub L/ < or = 13), absolute cross sections as well as the sharing ratios are found to be inconsistent with the previous theories. Possible reasons for these inconsistencies are given. The effect of the multiple ionization on the K-sharing ratios of the collisions partners is discussed.

• Research Organization: Hahn-Meitner-Institut fuer Kernforschung Berlin GmbH, Bereich Kern- und Strahlenphysik, 1000 Berlin 39, West Germany
• OSTI ID: 6197541
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 19:1; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular &amp; Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
AUGER EFFECT
BEAMS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRONIC STRUCTURE
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
HEAVY IONS
ION BEAMS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
K SHELL
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000