Ultraviolet photodissociation of Xe/sub 2/ /sup +/ and Kr/sub 2/ /sup +/ 1(1/2)/sub u/: Detection of rare-gas dimer ions in real time

Journal Article · Thu Sep 01 04:00:00 EDT 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.28.1440· OSTI ID:5541282

McCown, A W; Ediger, M N; Stazak, S M; Eden, J G

Momentary depletion of the Xe/sub 2/ /sup +/ (or Kr/sub 2/ /sup +/) 1(1/2)/sub u/ population is observed by photodissociating the molecule at 351.1, 337.1, or 307.9 nm (on the 1(1/2)/sub u/..-->..2(1/2)/sub g/ band) and monitoring the temporally resolved emission from the dissociative-recombination--fed neutral Xe line at 828.0 nm (6p(1/2)/sub 0/..-->..6s((3/2))/sub 1/). Near total suppression (>90%) of the Xe (6p..-->..6s) fluorescence is obtained for laser intensities of 50 MW cm/sup -2/. Measurements of the absolute electron density confirm that this effect is due to depletion of the dimer-ion concentration rather than photoionization of the 6p(1/2)/sub 0/ state. However, photoionization of the Xe (6s' or 6p) levels is observed and the cross section is measured to be 2.3 x 10/sup -18/ cm/sup 2/ at 351 nm. These experiments demonstrate a means for studying the collisional kinetics of rare-gas dimer ions in real time and in the presence of large background gas pressures.

• Research Organization: Department of Electrical Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
• OSTI ID: 5541282
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 28:3; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CHARGED PARTICLES
COLLISIONS
DIMERS
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELEMENTS
FLUIDS
GASES
ION COLLISIONS
IONIZATION
IONS
KRYPTON IONS
LASER RADIATION
MOLECULAR IONS
NONMETALS
PHOTODETECTORS
PHOTOIONIZATION
PHOTON COLLISIONS
PHOTON-ION COLLISIONS
RADIATIONS
RARE GASES
ULTRAVIOLET RADIATION
XENON IONS