Doppler-free two-photon absorption spectroscopy and the Zeeman effect of the A 1B2u←X 1A1g1401101 band of benzene
Doppler-free two-photon absorption spectroscopy and the Zeeman effect of the A 1B2u←X 1A1g1401101 band of benzene
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苯A 1B2u←X 1A1g1401101波段的无多普勒双光子吸收光谱和塞曼效应
DOI：
10.1063/1.1421069
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发表时间：
2002
影响因子：
4.4
通讯作者：
S. Nagakura
中科院分区：
文献类型：
--
作者：
M. Misono;Jinguo Wang;Miho Ushino;Mitsushi Okubo;H. Katô;M. Baba;S. Nagakura
用同波长光束在外腔内反向传播的双光子吸收光谱法测量了苯的a1b2u （v14=1,v1=1）←X 1A1g（v=0）跃迁的无多普勒吸收光谱和塞曼效应。充分解析了旋转线，分配了647条J= 0-43， K= 0-43的QQ线。测定了a1b2u （v14=1,v1=1）态的分子常数为A=B=0.181 046 1， C=0.090 548 9， DJ=0.544×10−7，DJK=−1.093×10−7，DK=0.587×10−7,T0=40 578.2672 cm−1。观察到给定J的线的塞曼分裂随K有规律地增加，并在K=J时达到最大值。这表明磁矩沿c轴（垂直于分子平面）。测定了a1b2u （v14=1,v1=1，J=43，K=43）能级的磁矩为0.005μB。观察到K=J能级的塞曼分裂随J的增加而增加。通过对旋转分辨塞曼光谱的分析，可以得出：
A Doppler-free absorption spectrum and the Zeeman effect of the A 1B2u(v14=1,v1=1)←X 1A1g(v=0) transition of benzene have been measured by means of two-photon absorption spectroscopy with counterpropagating light beams of identical wavelength within an external cavity. Rotational lines were fully resolved, and 647 QQ lines of J=0–43, K=0–43 have been assigned. The molecular constants of the A 1B2u(v14=1,v1=1) state have been determined as A=B=0.181 046 1, C=0.090 548 9, DJ=0.544×10−7, DJK=−1.093×10−7, DK=0.587×10−7, and T0=40 578.2672 cm−1. The Zeeman splittings for lines of a given J were observed to increase regularly with K and reach a maximum at K=J. This demonstrates that the magnetic moment lies along the c axis (perpendicular to the molecular plane). The magnetic moment of the A 1B2u(v14=1,v1=1,J=43,K=43) level was determined to be 0.005μB. The Zeeman splittings of the K=J levels were observed to increase with increasing J. Via analysis of the rotationally resolved Zeeman spectra, it is concluded t...