Fourier transform emission spectroscopy of the A1Π - X1 Σ+ transition in 74Ge80Se

For the first time, the electronic spectrum of the specific isotopomer 7 4 Ge 8 0 Se of germanium monoselenide was produced in a microwave discharge through an electrodeless quartz tube containing the single isotopes of 7 4 Ge and 8 0 Se and neon as carrier gas. The bands in the 35000-25000 cm - 1 region belonging to the main transition A 1 Π-X 1 Σ + were recorded on BOMEM DA8 Fourier transform spectrometer under medium (10 cm-') and high (0.05 cm - 1 ) resolutions. In all, an overwhelming 344 bands, including several new bands in the 28000-25000 cm-' 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.