Abstract
A near infrared broadband excimer emission band and an amplified sponaneous emission (ASE) of the Na2 violet excimer band have been observed by electron beam excitation of a dense sodium vapor. The continuum from 820 to 900 nm is attributed to the Na2 first bound-free transition band c3Σ+g→ a3Σ+u and the violet excimer band centered at 436 nm is attributed to the Na2 23IIg→ a3Σ+u bound-free emission which was already observed in the optical pumping. The mechanisms for the c3Σ+g state formation are proposed to be the three-body collision recombination and the atom-molecule collisional energy transfer. The formation of the 23IIg state is proposed by a dissociative recombination of Na3+ which is efficiently yielded by electron beam. In addition, a discrete structure band observed on the long wavelength side of the violet bands is believed from the Na2 21Σu+→ X1Σg+ bound-bound transitions.
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