ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The mobility of oxygen atoms generated from ultraviolet (UV) photolysis of O3 isolated in argon matrices is investigated both theoretically and experimentally. The simulations via molecular dynamics show that O(1D) atoms generated in single, double, and triple substitutional sites can migrate through the matrices by a distance about 1 nm within several picoseconds, but the photogenerated O(3P) atoms are confined to the original trapping sites. In order to examine the mobility of the O(1D) atoms experimentally, the probing molecules of CF3Br (or CF3I) are so highly diluted in the matrix of O3/Ar that the separations between the probing molecules and the precursor ozone molecules are sufficiently large, and the reaction products CF3OBr (or CF3OI) are observed after irradiation with a 266 nm laser. Based on an analysis of the reaction rates, it is shown that the products are only generated from the probing molecules reacting with the O(1D) but not O(3P) atoms, suggesting that matrices can serve as a "sieve" for selecting quantum states in chemical reactions. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.480636
