Abstract
Two broad continuous bands are observed in the visible following electron-impact ionization of an He-seeded molecular beam of SiBr4. By using tunable vacuum UV radiation from a synchrotron source to measure the threshold energy at which the fluorescence bands occur, it is shown that the bands are related to the initial formation of the C 2T2 state of the parent ion SiBr+4. By comparison with photoelectron data the bands are assigned to bound–free transitions in SiBr+4 C 2T2–A2T2 and X2T1. Analogous transitions are observed with GeBr+4, but CBr+4 does not fluoresce. The radiative lifetimes of SiBr+4 and GeBr+4 C 2T2 are 47.6 and 67.1 ns, respectively. The results are compared with the electronic emission spectra of the three tetrafluoro and tetrachloro molecular ions.
Original language | English |
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Pages (from-to) | 2021-2026 |
Journal | Chemical Society. Faraday Transactions. Journal |
Volume | 86 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1 Jan 1990 |