Étude du spectre du sélénium dans le rouge et l'infrarouge photographique

Abstract

Summary The band spectra of Se 2 were excited in a high frequency electrodeless discharge. The fluting bands on the long wavelength side of the main 1 — 1 system were investigated in some detail. These bands correspond to transitions between a quasi-stable electronic level situated at about 25000 cm–150 cm −1 ) and the high excited vibrational levels of the normal state (ω″ = 391 cm −1 ). The great difference between the frequencies of the two states explains the characteristic structure of this system. A new band system was observed; it can be represented by following formula:v = 16706 + 270 v′ − 2,5 0 − 325 v′ 2 + v ″ 2 ; the excited level is the same as that of the main system. The heat of dissociation of Se. is discussed. The value 1,9 V given previously by Rosen and Desirant seems to be the only one, agreeingwith existing spectroscopic data.