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Correlated charge changing ion-atom collisions. Progress report, March 15, 1984-March 15, 1985

Technical Report ·
OSTI ID:5297538
;
Correlations between x-ray emission and projectile charge-changing events have been investigated for highly charged ions incident on gas targets under single collision conditions. Measurements were made for 100 to 360 MeV /sub 20/Ca/sup 16,17,18+/ + He, 15 to 200 MeV /sub 16/S/sup 13 +/ + He, 100 to 370 MeV /sub 20/Ca/sup 12,16,17,18,19+/ + H/sub 2/, and 455 to 705 MeV /sub 57/La/sup 40 +/ + H/sub 2/. Coincidences between electron capture and K x-ray emission for Ca/sup q+/ + H/sub 2/ and He, combined with previous measurements for 180 to 460 MeV /sub 23/V/sup 19,20,21+/ + He, demonstrate the existence and substantiate the theory of resonant transfer and excitation (RTE). Additional K-shell RTE studies include theoretical calculations of the cross sections for Li-like ions with 14 less than or equal to Z less than or equal to 26 incident on He and Ne. The /sub 57/La/sup 40 +/ + H/sub 2/ measurements provide evidence for L-shell RTE. For S/sup 13 +/ + He new evidence is obtained for nonresonant transfer and excitation, a two-step process in which uncorrelated electron capture and projectile excitation occur in a single encounter. Total electron capture cross sections for S/sup 13 +/ + He vary by about 10/sup 5/ over the energy range investigated and are in reasonable agreement with empirical values. Other studies of electron capture and loss include measurements of the charge-state dependence for V/sup q+/ + He (q = 18 to 23) at 8.55 MeV/amu.
Research Organization:
Western Michigan Univ., Kalamazoo (USA). Dept. of Physics
DOE Contract Number:
AC02-83ER13116
OSTI ID:
5297538
Report Number(s):
DOE/ER/13116-4; ON: DE85017062
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CALCIUM IONS
CAPTURE
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
HELIUM
HYDROGEN
ION COLLISIONS
ION-ATOM COLLISIONS
ION-MOLECULE COLLISIONS
IONS
LANTHANUM IONS
MEV RANGE
MEV RANGE 100-1000
MOLECULE COLLISIONS
MULTICHARGED IONS
NONMETALS
RARE GASES
SPECTRA
SULFUR IONS
VANADIUM IONS
X-RAY SPECTRA