On the origin of the dip in the KrF laser gain spectrum

M. J. Shaw*, E. J. Divall, G. J. Hirst, C. J. Hooker, J. M.D. Lister, I. N. Ross, A. Kvaran, K. Osvay

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


High-resolution spectra of KrF (B-X) amplified spontaneous emission from various discharge-pumped and electron-beam-pumped KrF lasers have been analyzed. An underlying structured absorption spectrum has been discovered with a well-resolved peak at 248.91 nm. The absorption coefficient of this peak was found to vary in exact proportion to the peak laser gain coefficient but was independent of laser gas purity. We suggest that the absorption arises internally within the KrF molecule and is due to transitions from the B state to a higher-lying Rydberg state. This hypothesis was tested by simulating the absorption spectrum from KiF*(B) to a weakly repulsive state dissociating to Kr*(3P1)+F(2F3/2). A good agreement was obtained between simulated and experimental absorption spectra.

Original languageEnglish
Pages (from-to)1815-1824
Number of pages10
JournalJournal of Chemical Physics
Issue number5
Publication statusPublished - 1 Aug 1996


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