Showing papers by "Goran Pichler published in 1983"

Diffuse bands in the visible absorption spectra of dense alkali vapours

Abstract: The authors report the results of extensive absorption measurements in dense alkali vapours with the main emphasis on the diffuse bands, located close to the short wavelength end of the B1 Pi u-X1 Sigma g+ alkali-band system. At extremely high pressures they succeeded in observing Li2 and Na2 diffuse bands at about 422.5 and 436.5 nm, respectively. Detailed measurements of the absorption coefficient of potassium diffuse band at 575 nm show square dependence on the atom density and independence on the temperature. The relevant data for dense rubidium and caesium vapours have been remeasured. The authors believe that diffuse bands originate in a transition from the ground triplet state towards the 23 Pi g state, which suffer peculiar configuration interaction with the first excited ionic state of the same symmetry.

Interference and diffuse continua in the Rb2 spectrum

Abstract: Argon-ion laser-induced fluorescence measurements of rubidium vapour have been performed in order to study the 'quasi-continuum emission' of RB2 between 540 and 610 nm. By means of single longitudinal-mode excitations with 476.5 and 488 nm lines the authors found that this quasi-continuum band in the fluorescence spectrum consists of diffuse bands partly overlapped by the interference-type continuum, unresolved in previous experiments. This interference continuum appears at the longer wavelength end of the Stokes emission lines for a certain number of single longitudinal modes of 476.5 and 488 nm laser lines. The authors estimated the ground-state dissociation energy D0" (Rb2X1 Sigma g+)=4180+or-70 cm-1.