Photoassociation of Kr–F collision pairs in the ultraviolet
| Autor: | R. B. Jones, James Gary Eden, J. H. Schloss |
|---|---|
| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 99:6483-6494 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.465840 |
| Popis: | The bound←free absorption (photoassociation) of thermalized Kr(4p6 1S0)–F(2p5 2P) collision pairs has been studied in the ultraviolet in Kr/F2 gas mixtures by laser pump–probe techniques. Experiments carried out at 248 nm with two time‐delayed excimer laser pulses demonstrate that KrF(B2 Σ1/2+) molecules are produced by the photodissociation of F2, followed by the photoassociation of Kr–F collision pairs by a single ∼5 eV photon. The saturation behavior of this photoassociation process indicates that the currently accepted value for the KrF(B→X) stimulated emission cross section (2.6×10−16 cm2) is too large by at least a factor of 2. A revised value for σSE of (1.2±0.6)×10−16 cm2 is suggested. By indirectly monitoring the temporal decay of the atomic fluorine number density owing to reformation of F2, the rate constant for the recombination of F atoms in a Kr background by three‐body (2F+Kr) collisions has been determined to be kr=2×10−32 cm6 s−1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|