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在超声射流条件下获得了丁二酮在 4 32 4 51nm波段的激光诱导荧光激发谱 .在前人标识为 0 00 带谱峰的红端观察到 3个很弱的谱峰分别位于 0 ,87,97cm- 1 处 (以 2 2 182cm- 1 为 0cm- 1 ) .在 87和 97cm- 1 附近精细扫描 ,观测到 87和 97cm- 1 谱峰的隧道分裂分别为 1.0 5cm- 1 和 1.68cm- 1 ,与理论计算的分裂值符合得很好 ,从而确定了S1 ←S0 跃迁 0 00 带的位置在 2 2 182cm- 1 .87cm- 1 和 97cm- 1 处的谱峰分别为丁二酮基态S0 到激发态S1 的卡齿模 (G1 0 )和反卡齿模 (A1 0 )振动激发 .此外 ,首次对丁二酮S1 —S0 态激光诱导荧光激发谱进行较完整的标识 ,得出S1 态的羰基骨架扭曲振动模的振动频率 91.1cm- 1 ,非谐性常数 4 .875cm- 1 .
Laser-induced fluorescence excitation spectra of butanedione at 4 32 4 51 nm band were obtained under the condition of ultrasonic jet.The three weak peaks observed at the red end of the former 0 00 band were 0, 87 , 97cm-1 (0cm-1 at 2 2 182cm-1). Fine scans at 87 and 97cm-1 were observed with tunnel split at 87 and 97cm-1 peaks of 1.05cm-1 and 1.68cm- 1, which is in good agreement with the theoretically calculated splitting value, so that the spectral peaks at the positions of 0 2 0 2 0 1 0 1 0 0 and 1 0 97 cm -1 of the S1 ← S 0 transition are respectively the diacetyl ground state S 0 (G1 0) and anti-tooth gear (A1 0) in excited state S1.In addition, the laser-induced fluorescence excitation spectrum of butanedione S1 -S0 state was first completely identified and the S1 state was obtained The vibrational frequency of the torsional vibration mode carbonyl carbonyl skeleton 91.1cm-1, anharmonic constant 4. 875cm-1.