Fourier transform emission spectroscopy of the A1Π-X1Σ+ transition in 74GE80Se

For the first time, the electronic spectrum of the specific isotopomer (GeSe)-Ge-74-Se-80 of germanium monoselenide was produced in a microwave discharge through an electrodeless quartz tube containing the single isotopes of Ge-74 and Se-80 and neon as carrier gas. The bands in the 35000-25000 cm(-1) region belonging to the main transition A(1)Pi-X(1)Sigma(+) were recorded on BOMEM DA8 Fourier transform spectrometer under medium (10 cm(-1)) and high (0.05 cm(-1)) resolutions. In all, an overwhelming 344 bands, including several new bands in the 28000-25000 cm(-1) region have been assigned to the A-X system. The observation of isotopically pure spectrum has enabled a comprehensive vibrational analysis of the A-X bands. The Franck-Condon factors (FCF) and r-centroids were computed and the observed intensities were compared with the FCFs. To facilitate the FCF calculations the rotational analysis of the (0-5) band has also been carried out.