Electronic, vibrational, and rotational structures in the S(0) (1)A(1) and S(1) (1)A(1) states of phenanthrene.
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概要
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Electronic and vibrational structures in the S(0) (1)A(1) and S(1) (1)A(1) states of jet-cooled phenanthrene-h(10) and phenanthrene-d(10) were analyzed by high-resolution spectroscopy using a tunable nanosecond pulsed laser. The normal vibrational energies and molecular structures were estimated by ab initio calculations with geometry optimization in order to carry out a normal-mode analysis of observed vibronic bands. The rotational structure was analyzed by ultrahigh-resolution spectroscopy using a continuous-wave single-mode laser. It has been demonstrated that the stable geometrical structure is markedly changed upon the S(1) ← S(0) electronic excitation. Nonradiative internal conversion in the S(1) state is expected to be enhanced by this structural change. The observed fluorescence lifetime has been found to be much shorter than the calculated radiative lifetime, indicating that the fluorescence quantum yield is low. The lifetime of phenanthrene-d(10) is longer than that of phenanthrene-h(10) (normal deuterium effect). This fact is in contrast with anthracene, which is a structural isomer of phenanthrene. The lifetime at the S(1) zero-vibrational level of anthracene-d(10) is much shorter than that of anthracene-h(10) (inverse deuterium effect). In phenanthrene, the lifetime becomes monotonically shorter as the vibrational energy increases for both isotopical molecules without marked vibrational dependence. The vibrational structure of the S(0) state is considered to be homogeneous and quasi-continuous (statistical limit) in the S(1) energy region.
- 2012-04-21
論文 | ランダム
- 経済の新しい風 社長の通信簿 商社業界(その2)
- 経済の新しい風 社長の通信簿 商社業界(その1)
- 3.開催地を代表して(The Crustacean Society Summer Meeting in Japanと日本甲殻類学会第47回大会の合同大会を振り返って)
- 2.合同大会の総括(The Crustacean Society Summer Meeting in Japanと日本甲殻類学会第47回大会の合同大会を振り返って)
- 1.合同大会の概要(The Crustacean Society Summer Meeting in Japanと日本甲殻類学会第47回大会の合同大会を振り返って)