Deexcitation of metastable Ba/sup +/

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · J. Chem. Phys.; (United States)

OSTI ID:7075277

Walker, T G; Bonin, K D

This is a study of the deexcitation mechanisms of the metastable 5 /sup 2/D/sub 3//sub ///sub 2/ state of Ba/sup +/ in about 1 atm He buffer gas in the temperature range of 500--650 /sup 0/C. The ions were produced by three-photon ionization with light tuned to a resonance between two excited states of Ba, enabling the electron density to be varied independently of the temperature and pressure. The deexcitation is dominated by superelastic scattering of electrons with a cross section of sigma/sub se/ = 45 +- 20 A/sup 2/ (corresponding to an electron-impact excitation cross section of 11 A/sup 2/) and quenching by Ba atoms with a cross section of sigma/sub Ba/ = 130 +- 25 A/sup 2/. No dependence of the deexcitation rate on He density was detected, and we infer an upper limit on the cross section of sigma/sub He/ less than or equal to9 x 10/sup -22/ cm/sup 2/.

• Research Organization: Department of Physics, Princeton University, Princeton, New Jersey 08544
• OSTI ID: 7075277
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 89:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ALKALINE EARTH METALS
ATOM COLLISIONS
BARIUM
BARIUM IONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DE-EXCITATION
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
GAS LASERS
GASES
HELIUM
HIGH TEMPERATURE
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KINETICS
LASERS
METAL VAPOR LASERS
METALS
METASTABLE STATES
NONMETALS
RARE GASES
RELAXATION
SCATTERING