Doppler-free two-photon excitation spectroscopy and the Zeeman effects of the S1 1B1u(v21=1) <-- S0 1Ag(v=0) band of naphthalene-d8.
Doppler-free two-photon excitation spectroscopy and the Zeeman effects of the S1 1B1u(v21=1) <-- S0 1Ag(v=0) band of naphthalene-d8.
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萘-d8 S1 1B1u(v21=1) <-- S0 1Ag(v=0) 谱带的无多普勒双光子激发光谱和塞曼效应。
DOI：
10.1063/1.1875113
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
H. Katô
中科院分区：
文献类型：
--
作者：
Mitsushi Okubo;Jinguo Wang;M. Baba;M. Misono;Shunji Kasahara;H. Katô
测量了无多普勒双光子激发光谱和萘-d8的S1B1u(v21=1)和S01AG(v=0)跃迁的塞曼效应。归属了J=0-41，Ka=0-20的908条Q(Ka)Q(J)KaKc跃迁谱线，并测定了S1B1u(v21=1)态的分子常数。观测到了微扰，这些微扰被确定为源于科里奥利相互作用。没有观察到与三重态相互作用引起的微扰。观察到给定J的谱线的塞曼分裂随Kc的增加而增大，Kc=J能级的塞曼分裂随J的增加而线性增加。塞曼效应是由沿c轴的S1 1B1u态的磁矩引起的，这是由J-L耦合使S2 1B3u态混合到S1 1B1u态而引起的。从塞曼光谱中发现，旋转分辨能级没有与三重态混合。由此得出结论，孤立的萘在S11B1u态激发到低振子能级的非辐射衰变不是通过系间混合发生的。这与人们普遍接受的对无辐射衰变途径的理解是不同的。
Doppler-free two-photon excitation spectrum and the Zeeman effect of the S1 1B1u(v21=1) <-- S0 1Ag(v=0) transition of naphthalene-d8 have been measured. 908 lines of Q(Ka)Q(J)KaKc transition of J=0-41, Ka=0-20 were assigned, and the molecular constants of the S1 1B1u(v21=1) state were determined. Perturbations were observed, and those were identified as originating from Coriolis interaction. No perturbation originating from an interaction with triplet state was observed. The Zeeman splittings from lines of a given J were observed to increase with Kc, and those of the Kc=J levels increased linearly with J. The Zeeman effects are shown to be originating from the magnetic moment of the S1 1B1u state, which is along the c axis and is induced by mixing of the S2 1B3u state to the S1 1B1u state by J-L coupling. Rotationally resolved levels were found not to be mixed with a triplet state from the Zeeman spectra. Accordingly, it is concluded that nonradiative decay of an isolated naphthalene excited to low rovibronic levels in the S1 1B1u state does not occur through the intersystem mixing. This is at variance with generally accepted understanding of the pathways of the nonradiative decay.