Radative relaxation of the B̃(π -1 )EXCITED Electronic States of the Radical Cations of Rexafluorobenzene, Pentafluorobenzene, 1,2,3,4-, 1,2,3,5-, 1,2,4,5-TETRAFLUOROBENZENE, 1,3,5-, 1,2,4-TRIFLUOROBENZENE and 1,3-DIFLUOROBENZENE
作者： Michael Allan , John P. Maier , Oskar Marthaler
DOI: 10.1016/0301-0104(77)87099-7
关键词: Fluorobenzenes 、 Chemistry 、 Crystallography 、 Phase (matter) 、 Excited state 、 Atomic physics 、 Emission spectrum 、 Excitation 、 Radical ion 、 Hexafluorobenzene 、 Relaxation (NMR)
摘要: The lifetimes of the zeroth and some vibiationally excited levels B(π-1) states radical cations hexafluorobenzene (1), pentafluorobenzene (2), 1,2,3,4- (3), 1,2,3,5- (4) 1,2,4,5-(5)-tetrafluorobenzene, 1,3,5- (6) 1,2,4- (7)-trifluorobenzene in aaseous phase have been measured. were produced by 20—30 eV electron beam excitation samples at pressures < 10-3 torr 00 level (± 2 ns) found 1 -48 us, -47 ns, 3 - 50 4 5 30 6 58 os 7 10 ns. emission 1,3-difluoralienzene cation (8) has also now detected spectra fluorobenzenes 1-8,B → A, X band systems, are discussed. intensities B →A, transitions determined for 2-8 relative to 1. lack detectable from corresponding (ir1) radIcal 1,4-and 1,2-difluorobeozene, fluorobeuzene, besizene benzene-d6 indicates that quantum yields 10-5. implications positive negative results considered with respect electronic structures these species possible non-radiative pathways accessible such cations.
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