Energy transfer kinetics of the VUV emissions for Kr--Xe mixtures

Journal Article · Thu Jan 01 04:00:00 EST 1981 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.440803· OSTI ID:7035693

Salamero, Y; Birot, A; Brunet, H; Dijols, H; Galy, J; Millet, P; Montagne, J P

Spectroscopic study of KrXe mixtures shows large excitation energy transfers from krypton to xenon. When small quantitities of xenon are added to krypton, these processes can be seen through the fast disappearance of the continuous krypton emissions coupled with an increase in the atomic and molecular emissions of the minority gas. The excitation transfers are very efficient since the spectra of mixtures with only a few percent Xe are very similar in shape and intensity to those of pure xenon. Kinetic analysis of all the VUV emissions enabled a complete kinetic schema of the transfer phenomena to be drawn up. They are due to binary collisions from the molecular states, Kr(/sub 2/(/sup 3/..sigma../sub u//sup +/), which are responsible for the second krypton continuum (k/sub 2/=2.10/sup 7/ Torr/sup -1/ s/sup -1/) and from the atomic precursor states of molecular krypton (k/sub 1/=7.10/sup 6/ Torr/sup -1/ s/sup -1/). Both processes have large cross sections. The two paths compete in the creation of resonant Xe(/sup 3/P/sub 1/) states, either through direct molecule--atom transfer or by atom--atom transfer followed by infrared cascade emissions. In the mixture, the molecular Xe/sub 2/( states responsible for the 173 nm continuum have a different origin to that found in the pure gas. They are created by three-body collisions Xe((/sup 3/P/sub 1/)+Xe+Kr; the reaction constant is k=40 +- 10 Torr/sup -2/ s/sup -1/.

• Research Organization: Centre de Physique Atomique, Laboratoire associe au CNRS n 277 Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
• OSTI ID: 7035693
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
BINARY MIXTURES
COLLISIONS
DIMERS
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
ENERGY TRANSFER
FAR ULTRAVIOLET RADIATION
FLUIDS
GAS LASERS
GASES
KRYPTON
LASERS
MIXTURES
NONMETALS
RADIATIONS
RARE GASES
SPECTRA
ULTRAVIOLET RADIATION
XENON