Doubly differential detachment cross sections for 0. 5-MeV H sup minus on He including projectile excitation to H( n =2)

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Physical Review (Section) A: General Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevA.40.4926· OSTI ID:5287361

Liu, C; Starace, A F ^[1]

---

1. Department of Physics and Astronomy, The University of Nebraska, Lincoln, Nebraska 68588-0111 (US)

Detailed theoretical results are presented for the electron-detachment cross section, doubly differential in both the electron momentum and angle, for the process 0.5-MeV H{sup {minus}}+He{r arrow}H({ital n}=2)+{ital e}{sup {minus}}+He{sup *}. As discussed briefly elsewhere (C. R. Liu and A. F. Starace, Phys. Rev. Lett. 62, 407 (1989)), the laboratory-frame doubly differential cross sections (DDCS's) for electron detachment in the forward direction are shown to depend sensitively on the low-energy states of the H({ital n}=2)-{ital e}{sup {minus}} three-body system. In particular, the angular dependence of characteristic cusp and shape resonance features is presented. We find that the projectile frame DDCS for detached electron energies in the vicinity of the shape resonance peak is nearly isotropic. This is due in part to the {sup 1}P symmetry of the resonance feature, which limits the angular distribution to constant and cos{sup 2}{theta} terms, and in part to cancellation in the integral over momentum transfer on which the coefficient of the cos{sup 2}{theta} term depends.

• OSTI ID: 5287361
• Journal Information: Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:9; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ANIONS
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON DETACHMENT
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 100-1000
NONMETALS
NUMERICAL DATA
RARE GASES
SENSITIVITY ANALYSIS
THEORETICAL DATA