THE (5000) LOCAL MODE VIBRATIONAL-STATE OF GERMANE - A HIGH-RESOLUTION SPECTROSCOPIC STUDY

The high-resolution spectrum of natural abundant germane in the region 9775-9950 cm(-1) has been recorded. The observed spectrum is assigned as the (5000) stretching overtone band in local mode notation, which exhibits a striking resemblance to the K structure of parallel band of a symmetric top molecule. The observed transitions are analyzed in bo th the normal mode and the local mode pictures. The local mode vibrati on behavior of this state is also discussed. The stretch potential sur face is optimized by least squares fitting the band centers of all the germane isotopic species. An alternative approach is proposed to calc ulate the effective vibration-rotational parameters using the vibratio nal wavefunction obtained by the anharmonically coupled anharmonic osc illators model. (C) 1997 Academic Press.