Open AccessIntensities in the secondary spectrum of hydrogen at various temperatures
Publication year - 1927
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1927.0137
Subject(s) - atomic physics , molecular electronic transition , series (stratigraphy) , atomic electron transition , quantum number , hydrogen atom , physics , electronic systems , spectrum (functional analysis) , spectral line , excited state , quantum mechanics , engineering , paleontology , electronic engineering , group (periodic table) , biology
In recent years a great deal of progress has been made in the classification of the lines of the secondary spectrum of hydrogen. In particular, O. W. Richardson has included a large number of lines in a system involving electronic, vibrational and rotational terms, of which the Fulcher bands form an important part. This includes a number of band systems due to electronic transitions from a series ofm P levels to a 2S level, and one system due to the electronic transition from the 3S to the 2P level. Fig. 1 shows the electronic energy levels as compared with the corresponding levels in the helium atom. Fig. 2 shows the vibraional levels included in them P → 2S series, and fig. 3 some of the rotational levels included in the 3P → 2S system. In most of these bands, Q-branches only have been identified.