Magneto‐infrared spectra of the Si2, Ge2, and Sn2 molecules in rare‐gas matrices
Magneto‐infrared spectra of the Si2, Ge2, and Sn2 molecules in rare‐gas matrices
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DOI：
10.1063/1.467266
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发表时间：
1994-05
影响因子：
4.4
通讯作者：
S. Li;R. J. V. Zee;W. Weltner
中科院分区：
文献类型：
--
作者：
S. Li;R. J. V. Zee;W. Weltner
Si2、Ge2和Sn2的吸收光谱，在4k时，在氖和氩基体中在50 ~ 5000 cm−1范围内观察到，归属于最低的3Πu←X 3Σg−电子跃迁。在这三种情况下，振动带的frank - condon包络允许确定T00， ωe ', ωe ‘ xe ’。在Si2分子[接近情况(a)]中，T00=313 cm−1，每个振动带在上态分裂为Ω三联体（0,1,2）。在高达4 t的磁场下，这些谱线上存在塞曼效应。随着Ge2和Sn2中自旋轨道耦合的增大，观察到1u←X0+g跃迁[例(c)]，并确定了上态的相应参数。Sn2的磁偶极子1g←X0+g跃迁也被检测到，并通过在高达4 t的磁场中带的分裂和展宽来识别。结果在从头计算的背景下进行了讨论。
Absorption spectra of Si2, Ge2, and Sn2, observed between 50 and 5000 cm−1 in neon and argon matrices at 4 K, were assigned to the lowest 3Πu←X 3Σg− electronic transition. In all three cases, the Franck–Condon envelope of vibrational bands allowed T00, ωe’, ωe’xe’ to be determined. In the Si2 molecule [near Case (a)] T00=313 cm−1 and each vibrational band was split into Ω triplets (0,1,2) in the upper state. A Zeeman effect on these lines was detected in magnetic fields up to 4 T. As the spin–orbit coupling becomes larger in Ge2 and Sn2, the 1u←X0+g transition [case (c)] was observed, and the corresponding parameters in the upper state determined. For Sn2 the magnetic‐dipole 1g←X0+g transition was also detected and identified by the splitting and broadening of the band in magnetic fields up to 4 T. The results are discussed in the context of the ab initio calculations and other experimental results on these molecules.