Photodetachment collisions
A crossed-beams apparatus has been used to measure the cross sections (angular differential and integral) for photodetaching electrons from metastable He/sup/minus// and stable B/sup/minus// ions at /lambda/ = 696.2 nm. Kinematic effects were exploited, in a novel way, to enhance the precision of the measurements. The partial (angular integral) cross sections for He/sup /minus// photodetachment are /sigma/(2/sup 3/S) = 22.9 /plus minus/ 1.0 Mb and /sigma/(2/sup 3/P) = 10.0 /plus minus/ 0.6 Mb. The corresponding cross section for B/sup/minus// is /sigma/(2 /sup 2/) = 16.5 /plus minus/ 2.1 Mb. The calculated cross section for the photodetachment of D/sup /minus// was used to establish an absolute scale for the relative measurements. Radiative attachment cross sections are derived from the photodetachment results using the principle of detailed balance. 16 refs., 9 figs., 2 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5823323
- Report Number(s):
- CONF-890708-1; ON: DE89015908
- Country of Publication:
- United States
- Language:
- English
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Photodetachment of metastable He sup minus
Partial cross sections for the photodetachment of metastable He sup minus
Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
BORON IONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DEUTERIUM IONS
DISTRIBUTION
ELECTRON ATTACHMENT
ELECTRON DETACHMENT
ENERGY SPECTRA
HELIUM IONS
ION COLLISIONS
IONS
PHOTON COLLISIONS
PHOTON-ION COLLISIONS
SPECTRA