Thermal-energy charge transfer, quenching, and association reactions of doubly charged ions in the rare gases

Journal Article · Sun Jul 01 00:00:00 EDT 1979 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.20.87· OSTI ID:5980966

Johnsen, R; Biondi, M A

A drift-tube mass-spectrometer apparatus has been used to determine thermal-energy (300 K) charge transfer rate coefficients for reactions of the type R/sub a//sup ts2+/+R/sub b/..-->..R/sub a//sup +/+R/sub b//sup +asterisk/ and R/sub a//sup ts2+/+R/sub b/..-->..R/sub a//sup +/+R/sub b//sup ts2+/+e/sup -/ (transfer ionization), where R=He, Ne, Ar, Kr, and Xe. Rate coefficients for ions in the low-lying, metastable excited states (/sup 1/S and /sup 1/D) as well as the ground state (/sup 3/P) have been determined and, in some cases, deexcitation (quenching) coefficients for /sup 1/S and /sup 1/D ions have been measured. Reactions with an exoergicity ..delta..Eapprox.4 eV are found to be fast, approaching the limiting Langevin rate, while for ..delta..E<2 and >7 eV the rates fall off dramatically, in some cases dropping to the radiative value (approx.10/sup -14/ cm/sup 3//sec). The equilibrium constant for the three-body association reaction Xe/sup 2 +/+2 Ne arrow-right-left (Xe Ne)/sup 2 +/+Ne has been determined at 300 K.

• Research Organization: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
• OSTI ID: 5980966
• Journal Information: Phys. Rev., A; (United States), Vol. 20:1
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ION-ATOM COLLISIONS
ARGON IONS
HELIUM
HELIUM IONS
KRYPTON
KRYPTON IONS
NEON
NEON IONS
XENON
XENON IONS
ATOMIC IONS
CHARGE EXCHANGE
CHEMICAL REACTION KINETICS
DE-EXCITATION
METASTABLE STATES
MULTICHARGED IONS
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
ION COLLISIONS
IONS
KINETICS
NONMETALS
RARE GASES
REACTION KINETICS
640304* - Atomic
Molecular &amp; Chemical Physics- Collision Phenomena