The Vibrational-Rotational High-Resolution Spectrum in the Region of 3ν4, ν2 + 2ν4 and 2ν2 + ν4 Bands of the 72GeH4 Molecule

The high-resolution spectrum of the 72 GeH 4 molecule was recorded on a Bruker IFS 125HR Fourier spectrometer with an optical resolution of 0.003 cm –1 . The line positions were analyzed for ten interacting vibrational-rotational bands 3ν 4 (1 F 2 , F 1 2 F 2 ), ν 2 + 2ν 4 (1 E , F 1 , F 2 , 2 E ) and 2ν 2 + ν 4 (1 F 2 , F 1 , 2 F 2 ) in the range 2350–2750 cm –1 . As a result of the analysis, 1726 experimental lines were identified with the maximum value of the quantum number J max = 17; then used in the fitting procedure with parameters of the effective Hamiltonian. The resulting set of 35 spectroscopic parameters describes the vibrational-rotational structure of the spectrum with d rms = 7.5 × 10 –4 cm –1 .