Terki-Hassaïne M, Claveau C, Valentin A, Pierre G
Institut des Sciences Exactes, Université de Mostaganem, B.P. 227, Mostaganem, 27000, Algeria
J Mol Spectrosc. 1999 Oct;197(2):307-321. doi: 10.1006/jmsp.1999.7921.
The infrared spectrum of (28)SiH(4) between 2930 and 3300 cm(-1) was recorded using the Laboratoire de Physique Moléculaire et Applications (LPMA.) Fourier transform spectrometer. The instrumental response function width chosen makes it possible to obtain a Doppler-limited spectrum. The observed spectrum belongs to the tetrad built with one quantum of stretching mode (nu(1) or nu(3)) and one quantum of bending mode (nu(2) or nu(4)). The excited states are formed from eight vibrational sublevels: nu(1) + nu(2)(E), nu(1) + nu(4)(F(2)), nu(2) + nu(3)(F(1) + F(2)), and nu(3) + nu(4)(A(1) + E + F(1) + F(2)). The intricacy of the upper states was resolved using the variations of the line strength between the 297 K and 209 K spectra and the precise knowledge of the ground state. For analysis with the vibrational extrapolation method, we used the previous results for the fundamental bending dyad (nu(2)/nu(4)) and the stretching dyad (nu(1)/nu(3)). The Hamiltonian is expanded through the sixth order of approximation for the ground and the bending states, the fifth order for the stretching states, and the fourth order for the tetrad states in the Amat-Nielsen classification. About 1033 pieces of data are used in the analysis and the weighted standard deviation obtained is 4.6 x 10(-3) cm(-1). Copyright 1999 Academic Press.
使用分子物理与应用实验室（LPMA）的傅里叶变换光谱仪记录了（28）SiH（4）在2930至3300 cm（-1）之间的红外光谱。所选择的仪器响应函数宽度使得获得多普勒极限光谱成为可能。观测到的光谱属于由一个伸缩模式量子（ν（1）或ν（3））和一个弯曲模式量子（ν（2）或ν（4））构成的四重态。激发态由八个振动子能级形成：ν（1）+ν（2）（E）、ν（1）+ν（4）（F（2））、ν（2）+ν（3）（F（1）+F（2））以及ν（3）+ν（4）（A（1）+E+F（1）+F（2））。利用297 K和209 K光谱之间谱线强度的变化以及基态的精确知识，解决了高能态的复杂性。为了用振动外推法进行分析，我们使用了之前关于基本弯曲二重态（ν（2）/ν（4））和伸缩二重态（ν（1）/ν（3））的结果。在阿马特 - 尼尔森分类中，哈密顿量对于基态和弯曲态展开到六阶近似，对于伸缩态展开到五阶近似，对于四重态展开到四阶近似。分析中使用了约1033条数据，得到的加权标准偏差为4.6×10（-3）cm（-1）。版权所有1999年学术出版社。
