Abstract

The emission spectrum of mercury hydride has been photographed in the second and third orders of a 21-ft concave grating in the region 2930—4550 Å. The light source was an electrodeless discharge tube containing a drop of mercury in an atmosphere of hydrogen and argon. Twenty-six bands of the <i>A-X</i> system and four bands of the <i>B-X</i> system have been analyzed, most of them to their predissociation limits. A table of these bands and a vibrational energy-level diagram are given. The behavior of the lambda-type doubling in the <sup>2</sup>II state for which the electronic coupling is Hund’s case α is compared with the theoretical prediction.

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