The Absorption Spectra of Some Hydride Compounds in the Ultra-Violet

The vapor of the metal was heated to about 1700°C in a carbon tube and hydrogen slowly admitted. Under these conditions several hydride bands were absorbed. The four bands found for copper hydride confirm the analysis of Frerichs. Eight silver hydride bands were absorbed which enabled us to form the $n_1{n}_2$ scheme. The five gold hydride bands found confirm and extend the work of Bengtsson and three new bands, farther down in the ultra-violet, indicate a new electronic level. Three aluminum hydride bands were absorbed which support the analysis of Eriksson and Hulthèn. On nearly all our plates the OH bands at 3064 and 2852 were absorbed. Some bands were found which may be due to the oxides of calcium and silver. We were unable to observe absorption at the CdH and CH bands which are shaded toward the violet.