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Fourier transform infrared spectra of the monoisotopic species H 3  74 Ge 79 Br and H 3  74 Ge 81 Br have been recorded in the ν 1 /ν 4  region near 2100 cm -1  with a resolution of 0.015 cm -1  and in the ν 6  and 2 ν 6  regions near 580 and 1150 cm -1  with a resolution of 0.04 cm -1 . Rotational analyses based on ~ 1500, ~1100 and ~ 300 data of ν 1 /ν 4 , ν 6  and 2 ν 6  respectively for each isotopomer have been performed, and ground state and excited state vibrational, rotational and rovibrational parameters have been determined, ν 1 , 2115.815 0(2)/2115.813 4(2) cm -1 , and ν 4 , 2126.016 5(1) 2126.016 7(1) cm -1  (H 3  74 Ge 79 Br/H 3  74 Ge 81 Br), are weakly coupled by Coriolis x, y resonance, ζ 1,4  ≃ - 0.021. ν 6 , 577.601 2(4)/577.541 7(4) cm -1 , and ν 4  are affected by / (±2, ±2) resonance. Furthermore, the hot bands (ν 1 +ν 3 )-ν 3 , (ν 3 +ν 4 )-ν 3 , (ν 3 +ν 6 )-ν 3 , 2ν 6  ±2  - ν 6  ±2  and 2ν 0  6  - ν 6  ±1  have been detected and analyzed.

zeitschrift für naturforschung a

Vibrational Spectra and Force Constants of Symmetric Tops, XLIII [1] Fourier Transform Infrared Spectra of Monoisotopic H 3 GeBr Species in the ν 1 /ν 4  and ν 6  Region