Excitation mechanisms of the CW He-As laser

J. A. Piper*, I. M. Littlewood, C. E. Webb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The collisional processes responsible for populating and depopulating excited As+ levels in the He-As system have been studied using flowing afterglow techniques. Excitation of several As+ levels lying above the energetic limit for charge transfer from the neutral atom ground state has also been observed. The process responsible for this excitation has been identified as He+ charge transfer on arsenic metastables. The experiments further indicate strong effects due to rapid transfer of population among the excited As+ levels due to second-kind collisions of electrons. The very noticeable preference for abnormally high helium pressure for optimum operation of tbe He-As laser system can he understood in the light of these results.

Original languageEnglish
Article number018
Pages (from-to)3731-3744
Number of pages14
JournalJournal of Physics B: Atomic and Molecular Physics
Issue number21
Publication statusPublished - 1978


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