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Intensity measurements in the helium spectrum

Hodges, Clarence and Michels, W. C. (1928) Intensity measurements in the helium spectrum. Physical Review, 32 (6). pp. 913-917. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:HODpr28

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Abstract

The absolute and relative intensities of thirteen lines of the helium spectrum, extending through the visible region, have been measured by a modification of the method developed by Ornstein and Dorgelo. The change of the method has consisted in comparing each line directly with the known emission from a tungsten filament, operated under constant conditions. The results for a discharge in a capillary tube, with pressures from 1.92 to 34.3 mm show that the absolute intensities increase rapidly to a maximum for pressures in the neighborhood of 2 to 4 mm, below which they tend toward zero. The relative intensities of the singlet system are favored by lowered pressures, and the higher members of the triplet system are likewise favored over the lower members, while the relative intensities within the singlet series show little effect of pressure.


Item Type:Article
Additional Information:©1928 The American Physical Society. Received 16 August 1928. The authors wish to express their indebtedness to Dr. R.A. Millikan and to Dr. I.S. Bowen for their interest in the work and the help they have rendered us.
Issue or Number:6
Record Number:CaltechAUTHORS:HODpr28
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HODpr28
Alternative URL:http://dx.doi.org/10.1103/PhysRev.32.913
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6954
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Jan 2007
Last Modified:26 Dec 2012 09:27

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