This is consistent with Kirchhoff's law and shows that the sodium in a flame possesses the same relative radiation and absorption as sodium vapour heated thermally to the temperature of the flames.
P. Langley in 18 93 at Mount Whitney in California (14,000 ft.), with the bolometer, an exceedingly sensitive instrument which he invented, and which enabled him to feel his way thermally over the whole spectrum, noting all the Constant.
The ammonium salts do not sublime, really; they thermally dissociate into substances that recombine to the ammonium compound on cooling.
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Since electron ionization is a gas phase technique, it may not be suitable for involatile or thermally labile compounds.