Charge changing collisions between fast hydrogen beams and alkaline earth metal atoms

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5978720

Mayo, M R

Electron transfer cross sections and negative ion equilibrium fractions for H/sup +/ and H/sup 0/ collisions with Alkaline Earth atoms have been measured for energies between 1 and 100 keV. Absolute total cross sections for single- and double-electron capture by H/sup +/ in collisions with Mg, Ca, Sr, and Ba have been measured. The single-electron-capture cross section has been calculated using the classical binary encounter formalism of Gryzinski and that of Tan and Lee. The Gryzinski model shows better overall agreement with the data. For collisions of H/sup +/ with Mg and Ba, the cross section for single-electron-capture into the specific 2s state of hydrogen has been measured employing the Stark Effect for electric field induced emission of Lyman-alpha radiation. The negative ion equilibrium fraction has been measured for collisions of D/sup +/ with Mg, Ca, Sr, and Ba for energies between 1 and 1000 keV. Also, absolute total cross sections for single-electron capture and loss by H/sup 0/ in collisions with Ca and Sr have been measured. A simple picture of keV ion-atom electron capture collisions is presented and the concepts of a cross section and equilibrium fraction developed. For low energy projectiles the ion-atom collision is discussed in terms of a molecular picture, and the importance of inner shell capture is discussed for high energy collisions. The measured cross sections are discussed in terms of these two concepts, and recent calculations of molecular potential energies and low energy cross sections by Olson and Liu aid in the discussion.

• Research Organization: Wesleyan Univ., Middletown, CT (USA)
• OSTI ID: 5978720
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ATOM COLLISIONS
BARIUM
CALCIUM
CAPTURE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
HYDROGEN IONS
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
KEV RANGE 10-100
MAGNESIUM
METALS
NUMERICAL DATA
STRONTIUM
THEORETICAL DATA