Abstract

The first bound-free triplet emission band cΣ3g+aΣ3u+ of Na2 was observed by electron-beam excitation of a dense Na vapor. The unfavorable selection rules for optical pumping the upper state were found to be compensated for by collisional energy transfer from the 3P-state atom, which was efficiently excited by the electron beam. The main mechanisms of energy transfer for the upper-state formation are proposed to be three-body collision recombination and atom–molecule collisional energy transfer.

© 1991 Optical Society of America

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