✍ Scribed by G. Pichler; J.T. Bahns; K.M. Sando; W.C. Stwalley; D.D. Konowalow; L. Li; R.W. Field; W. Müller
No coin nor oath required. For personal study only.
The puzzling violet bands of sodium (= 425-460 nm), known since 1932, are shown conclusively to arise from the superposition of two distinct continuum emission bands -one singlet (2 'Z: +X 'Z:) and one triplet (primarily 2 'lT,-+ I 'Z:). Each continuum emission system shows complex interference structure arising from multiple branches of the Mulliken difference potential.
Since the first observation [l] of the violet bands of sodium vapor in 1932, there have been over thirty publications dealing with these bands and their interpretation (which will be examined in a forthcoming review by two of us (GP and WCS)). Suffice it to say that these bands have been seen in absorption, and especially in emission following electrical or single-or multi-photon excitation in a wide variety of experiments, usually at total pressures k 0.1 Torr. In addition, their use as a laser transition has
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