Physics – Optics
Scientific paper
Apr 1929
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1929natur.123..529b&link_type=abstract
Nature, Volume 123, Issue 3101, pp. 529 (1929).
Physics
Optics
4
Scientific paper
THE beryllium arc in a hydrogen atmosphere emits two band systems-one in the green region at 4800-5120 A., and the other one in the ultra-violet from λ3700 and extending as far as can be reached by quartz optics. Very recently both band systems have been measured and analysed by W. W. Watson (Phys. Rev., 32, 600; 1928), and independently of this, M. Petersen (Phys. Rev., 31, 1130; 1928) has given a short account of the green system. Both investigators state that this system belongs to an electronic transition 2P-->2S of beryllium hydride, thus apparently corresponding to the long set of well-known band systems emitted by hydrides of magnesium, calcium, zinc, cadmium, and mercury. The ultra-violet system was analysed by Watson only in the region λ3700-2700 and thus permits no definite statements regarding the pure electronic transition, n' = n'' = 0, which falls below λ2700. However, as pointed out by Watson, the investigation of the band n' = n'' = 0 is necessary for information regarding the origin of the ultra-violet system. Watson hesitates between two alternatives: the ultra-violet system emitted by beryllium hydride having a common final state with the green system 2S --> 2S, or belonging to an ionised BeH+ molecule, the transition being of the type 1S --> 1S.
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