Probabilities for 2s-2p excitation ion-atom collisions

Journal Article · Fri Jun 01 04:00:00 EDT 1979 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.19.2180· OSTI ID:6249944

McGuire, J H; Land, D J; Brennan, J G; Basbas, G

Expressions are derived using the semiclassical Coulomb approximation for probabilities for 2s-2p excitation during a collision between a target atom and a proton. Results of calculations are presented. For proton energies above 1 MeV the transition probabilities are less than approx. 0.03. Unlike excitation from one atomic shell to another, our intrashell results are largely independent of the target atomic charge Z/sub 2/ and binding-energy difference ..delta..E/sub 2s/2p. The shapes of our impact-parameter distributions, when scaled to the atomic radius, are similar for various targets. However, for a given target, the dependence of the m = 0 and m = +- 1 amplitudes on both impact parameter B and ..delta..E//sub 2s/2p is quite different, indicating that the polarization of light emitted in subsequent 2p-1s transitions may vary with both B and ..delta..E/sub 2s/2p. Furthermore, near B = 0 the probabilities are sensitive to ..delta..E/sub 2s/2p, which varies with the charge state of the target atom. Consequently, the authors suggest that dependences of collision cross sections and probabilities on the atomic charge state may be investigated by considering impact-parameter dependence or polarization fractions in 2s-2p atomic excitation by ion impact.

• Research Organization: Naval Surface Weapons Center, White Oak, Maryland 20910
• OSTI ID: 6249944
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 19:6; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CATIONS
CHARGE STATE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
IMPACT PARAMETER
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MEV RANGE
ORIENTATION
P STATES
POLARIZATION
S STATES
SEMICLASSICAL APPROXIMATION
SPIN ORIENTATION