Differential charge state fractions of He following ionization by fast H/sup /minus// projectiles

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6763578

Giese, J P; Horsdal, E

The differential charge state fractions of He ions produced in ionization by fast H/sup /minus// projectiles have been measured at projectile scattering angles between 0.25 and 1.59 mrad and an impact energy of 1.0 MeV. These charge state fractions have been measured for each of the possible final charge states of the H/sup /minus// projectile (H/sup /minus//, H, and p/sup +/). Combined with earlier measurements of simple ionization (no change in projectile charge state) by protons and of capture and ionization by protons, some systematics cam be noted. The fraction of doubly charged He ions exhibits a distinct peak between 0.9 and 1.1 mrad for simple ionization. A similar peak is seen at approx.0.55 mrad for ionization accompanied by either capture by protons or by single stripping of H/sup /minus//. The data for proton impact suggest that all the peaks are related to double ionization of the target. The double ionization mechanisms will be discussed in terms of their possible contribution to the observed structures. 13 refs., 3 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6763578
• Report Number(s): CONF-881151-14; ON: DE89001205
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
ATOM COLLISIONS
CHARGE STATE
CHARGED PARTICLES
COLLISIONS
ELEMENTS
FLUIDS
GASES
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
NONMETALS
RARE GASES
SCATTERING