Formation of doubly excited two-electron ions during F/sup 8 +/+He, F/sup 8 +/+Ne, and F/sup 8 +/+Ar collisions

Journal Article · Fri Feb 01 04:00:00 EST 1985 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.31.734· OSTI ID:6162915

Pepmiller, P L; Richard, P; Newcomb, J; Hall, J; Dillingham, T R

High-resolution x-ray spectroscopy has been used to measure the cross sections for forming doubly excited F/sup 7 +/ ions in the 2s2p and 2p/sup 2/ configurations following F/sup 8 +/+He, F/sup 8 +/+Ne, and F/sup 8 +/+Ar collisions over a projectile-energy range of 13--31 MeV. The intermediate states are found to be formed predominantly by projectile-electron excitation coupled with target-to-projectile electron transfer to an excited state during a single ion-atom collision. This process is termed nonresonant transfer and excitation (NTE) (P. L. Pepmiller et al., IEEE Trans. Nucl. Sci. NS-30, 1002 (1983)). A competing process for formation of the doubly excited states is resonant transfer and excitation (RTE) (D. Brandt, Phys. Rev. A 27, 1314 (1983)), a process analogous to dielectronic recombination. Although the projectile energies spanned the region where resonant transfer and excitation are expected to maximize, no resonant contribution to the measured cross sections could be positively identified for the collision systems studied here. This result is consistent with the relative magnitudes of the theoretical cross sections for resonant and nonresonant transfer and excitation presented in the present work.

• Research Organization: James R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506
• OSTI ID: 6162915
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 31:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
CAPTURE
CHARGED PARTICLES
CHEMICAL ANALYSIS
COLLISIONS
CROSS SECTIONS
DATA
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
FLUIDS
FLUORINE IONS
GASES
HELIUM
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MEV RANGE
MEV RANGE 10-100
MULTICHARGED IONS
NEON
NONDESTRUCTIVE ANALYSIS
NONMETALS
NUMERICAL DATA
RARE GASES
X-RAY EMISSION ANALYSIS