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, 5 AND 6 VIBRATION - ROTATION BANDS OF HBr.
N. NISHIMIYA, T. YUKIYA AND M. SUZUKI, Dept. of Electronic Engineering, Tokyo Institute of Polytechnics, Iiyama 1583, Atsugi City, 243-02 Kanagawa, Japan.
\hspace3em The vibration - rotation spectrum of H79/81Br have been studied using a GaAs semiconductor laser and a titanium sapphire ring laser in the near infrared region. The rotational fine structures up to J=15 could be detected using a 20 m absorption cell. About 100 lines have been assigned in v = 3~<-~0, 5~<-~0 and 6~<-~0 bands with a resolving power of 0.001 cm-1. Spectroscopic constants have been calculated with a least-squares fitting procedure by using the spectroscopic constants of v=0 reported by Lonardo and Fusina ( 1 ). The values in cm-1 are determined as below; \begintabbing 12345 \= G3 - G0 \= = \= 17405.2618(81)12345 \= B3 \= = \= 7.656220(15)12345 \= D3× 104 \= = \= 3.3701(5) \kill \> G3 - G0 \> = \> \hspace0.5pc7405.2618(8) \> B3 \> = \> 7.656220(15) \> D3× 104 \> = \> 3.3701(5)
\> \> \> \hspace0.5pc7404.1937(10) \> \> \> 7.653951(18) \> \> \> 3.3673(5)
\> G5 - G0 \> = \> 11887.9321(5) \> B5 \> = \> 7.190004(18) \> D5× 104 \> = \> 3.3661(10)
\> \> \> 11886.2940(5) \> \> \> 7.187967(18) \> \> \> 3.3640(10)
\> G6 - G0 \> = \> 13990.8191(10) \> B6 \> = \> 6.953022(45) \> D6× 104 \> = \> 3.3777(35)
\> \> \> 13988.9406(3) \> \> \> 6.951116(15) \> \> \> 3.3782(13).
\endtabbing The numbers given in the upper rows are those of I79Br. The Dunham's coefficients of HBr have also been determined by a joint analysis with the constants reported by the references ( 1, 2 \,).
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( 1 \,) G.~Di~Lonardo, and L.~Fusina, \sl J.~Mol.~Spectrosc., 148, 86--92 (1991).
( 2 \,) V.~Braun, and P.~F.~Bernath, \sl J.~Mol.~Spectrosc., 167, 282--287 (1994).