Laser-induced fluorescence and phosphoresence of C{sub 60} isolated in solid Ne
- National Tsing Hua Univ., Hsinchu (Taiwan, Province of China)
Laser-induced fluorescence spectrum of C{sub 60} isolated in solid Ne with resolved vibronic lines was recorded with laser excitation at 355 nm or in the 585-645 nm region. The spectrum consists of progressions with spacings nearly 260 cm{sup -1}, each separated by varied intervals from the origin at 15648 cm{sup -1}. The intervals 272, 412, 971, 1452, 1587, 2883, 2924, and 3023 cm{sup -1} correspond to various vibrational levels of g{sub u} and h{sub u} symmetry, or their combination with the a{sub g}(1) level, of the ground electronic state; the nearly 260 cm{sup -1} progression (with 272 cm{sup -1} as the first spacing) corresponds to the Jahn-Teller active h{sub g}(8) mode. When the Ne matrix was doped with Xe (1.2%), phosphorescence of C{sub 60} was greatly enhanced. The spectrum exhibited a single progression with origin at 12773 cm{sup -1} and spacings near 260 cm{sup -1}; its lifetime at 5 K was approximately 90 {mu}s. The fluorescence excitation spectrum revealed progressions of spacings either nearly 180 or nearly 260 cm{sup -1}, corresponding to excitation to two different singlet excited states, respectively. The first excited singlet and triplet states observed in this work are proposed to be A {sup 1}T{sub 2g} and a {sup 3}T{sub 2g}, respectively. The second excited singlet state, proposed to be B {sup 1}T{sub 1g}, lies approximately 200 cm{sup -1} above the A {sup 1}T{sub 2g} state. 48 refs., 3 figs., 4 tabs.
- OSTI ID:
- 226760
- Journal Information:
- Journal of Physical Chemistry, Vol. 100, Issue 10; Other Information: PBD: 7 Mar 1996
- Country of Publication:
- United States
- Language:
- English
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