CH₂F³⁷Cl的ν₄和ν₉带系的红外激光光谱学

Infrared Laser Spectroscopy of the nu4 and nu9 Band System of CH2F37Cl.

作者信息

Baldacci A, Stoppa P, Giorgianni S, Ghersetti S

机构信息

Dipartimento di Chimica Fisica, Università di Venezia, D.D. 2137, Venice, I-30123, Italy

出版信息

J Mol Spectrosc. 1999 Mar;194(1):73-78. doi: 10.1006/jmsp.1998.7770.

DOI:10.1006/jmsp.1998.7770

PMID:9986776

Abstract

The spectra of CH2F37Cl (95% isotopically pure sample) have been recorded at high resolution with a tunable diode laser spectrometer in the regions 979-1030 and 1108-1136 cm-1. The spectral analysis allowed us to assign about 2000 lines (J </= 61, Ka </= 26) of the nu9 band (nu0 = 1001.9360 cm-1), which, besides the expected c-type component, shows a more intense Coriolis-induced parallel component deriving its intensity from mixing with the nu4 vibrational state. In addition, the assignments of the nu4 band (nu0 = 1067.7138 cm-1), previously investigated, have been extended to higher Ka values and about 1300 new lines (J </= 69, 17 </= Ka </= 26) have been identified. The nu4 and nu9 bands have been fitted simultaneously to account for the first-order a- and b-type Coriolis coupling; interaction constants and excited state parameters up to the sextic terms have been obtained using Watson's A-reduction Hamiltonian in the Ir representation. Copyright 1999 Academic Press.

摘要

利用可调谐二极管激光光谱仪在979 - 1030和1108 - 1136厘米⁻¹区域记录了CH₂F³⁷Cl（95%同位素纯样品）的高分辨率光谱。光谱分析使我们能够归属约2000条ν₉带（ν₀ = 1001.9360厘米⁻¹）的谱线（J ≤ 61，Ka ≤ 26），该谱带除了预期的c型成分外，还显示出一个更强的科里奥利诱导平行成分，其强度源于与ν₄振动态的混合。此外，之前研究过的ν₄带（ν₀ = 1067.7138厘米⁻¹）的归属已扩展到更高的Ka值，并且已识别出约1300条新谱线（J ≤ 69，17 ≤ Ka ≤ 26）。同时对ν₄和ν₉带进行了拟合，以考虑一阶a型和b型科里奥利耦合；使用沃森的A约化哈密顿量在Ir表示中获得了直至六次项的相互作用常数和激发态参数。版权所有1999年，学术出版社。