Absolute experimental cross sections for the electron impact ionization of rubidium

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5280543

Hughes, D W

The absolute cross sections for the double, triple, and quadruple ionization of Rb/sup +/ ions by electron impact have been measured from below their respective thresholds to approximately 3000 eV. This determination has been accomplished using a crossed beam facility in which monoenergetic beams of ions and electrons are caused to intersect at right angles in a well-defined collisions volume. Multiply charged, product ions born as a result of the electron impact are deflected into their respective detectors by cascaded electrostatic analyzers. The multiply charged beam current component is measured by means of a vibrating reed electrometer operating in the rate-of-charge mode. The required singly charged rubidium ions are produced in a thermionic ion source and pass through a series of focusing, collimating and deflecting structures before entering the interaction region. A thermionically generated, rectangular electron beam intercepts the target ions in a spatially designated collision volume. Just prior to entering this interaction region the two beams can be made to pass through a movable slit scanner which determines their spatial profiles. The various charged particle currents, energies and beam current density distributions represent the experimental data from which the desired absolute cross sections have been determined. The results obained with this technique are compared with available theoretical predictions of the electrom appropriate cross sections.

• Research Organization: Georgia Inst. of Tech., Atlanta (USA)
• OSTI ID: 5280543
• Country of Publication: United States
• Language: English

Related Subjects

640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BEAM ANALYZERS
BEAM CURRENTS
BEAMS
CHARGED PARTICLES
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
CURRENTS
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTROMETERS
ELECTRON BEAMS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELECTROSTATIC ANALYZERS
ENERGY RANGE
EQUIPMENT
ION BEAMS
ION COLLISIONS
ION SOURCES
IONIZATION
IONS
KEV RANGE
KEV RANGE 01-10
LEPTON BEAMS
MEASURING INSTRUMENTS
PARTICLE BEAMS
RUBIDIUM IONS