Abstract
The absorption and emission spectra of dense sodium vapour have been measured between 790 nm and 1000 nm. In the emission spectrum from the high-pressure sodium lamp we observed the characteristic continuum structure at 882 nm which we interpreted as a satellite band originating from the 1 3Σ + g−1 3Σ + u transition. The complementary absorption measurements in very dense sodium vapour revealed only certain structures near the head of heads of the A–X molecular band, but not a continuous band at 882 nm.
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