Abstract

In the present work we report on the molecular spectroscopy related to transitions from the relaxed ${}^3{\Sigma }_{\text{u}}^{+}$ ( ${}^3{\text{P}}_2$krypton excimer state using time and spectrally resolved laser reduced fluorescence (LRF techniques).¹Despite the predissociative nature of highly excited states,^2,3such an approach allows to obtain molecular spectra as displayed in Fig. 1A. Bound-bound transitions showing molecular structures occur mainly for absorptions from ${}^3{\Sigma }_{\text{u}}^{+}$ towards ³Π_gexcimer states. Such a result was recently predicted by ab initiocalculations.⁴Indeed, electronic states of ^3,1Π_gparentage have the same $\left[{}^2{\Sigma }_{\text{u}}^{+}\right]{\pi }_{\text{u}}6\text{p}$ character in the whole internuclear distance range and have only one strongly localized crossing. ^3,1Π_gstates are split into five states, one $0_{\text{g}}^{-}$, one $0_{\text{g}}^{+}$, two 1_g, and one 2_gtaking account of spin orbit coupling.

© 1994 IEEE