Laser Excited Fluorescence Spectra of Gaseous Te₂

Abstract

Three lines of the argon ion laser have been used to excite spectra of 128 Te 2 and 130 Te 2 which have been photographed with moderate resolution (up to about 300 000). Excitation is critically dependent on the operation of the laser as between multimode or single mode. The development of rotational structure can be varied by control of the pressure of Te 2 . In addition to the systems A 0 u + , B 0 u + –X 0 g + , well known in the absorption spectrum, four series assigned to B 0 u + –X 1 g have been analyzed and a new system ascribed to B 1 u ± –X 1 g ± has been discovered. Constants (in cm −1 ) for the ground state of 130 Te 2 are as follows:[Formula: see text]It is concluded that laser fluorescence spectroscopy, even with fixed frequency lasers, has some advantages over conventional absorption and emission studies.