Photolysis of hydrogen and fluorine in solid argon. Matrix infrared spectra of (HF)2, (HF) (DF), and (DF)2

摘要

Argon diluted samples of H2and F2were codeposited at 10 K, and little reaction was observed. Photolysis produced a strong new 3826 cmminus;1band, in agreement with assignment to (HF)2from HF codeposition experiments, weak HF monomer and trimer bands, and a sharp new 3930 cmminus;1band for the H=HF intermediate species. Sample annealing markedly increased trimer, relative to dimer and monomer, and destroyed the intermediate species. Similar experiments were done with D2and HD; the latter gave a strong 2808 cmminus;1absorption for the more stable (HF) (DF) mixed dimer and a weak 3832 cmminus;1band for the less stable (DF) (HF) mixed dimer. The ability of the argon matrix cage to quench substantial reaction exothermicity is demonstrated by the preferential stabilization of (HF)2in these experiments.