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IV.—The Fulcher Bands of Hydrogen

Published online by Cambridge University Press:  15 September 2014

Ian Sandeman
Ian Sandeman
Affiliation:
University Of St Andrews
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Summary

The Fulcher Bands of Hydrogen have recently been arranged by Richardson. An examination of Richardson's arrangement in the light of recent accurate measurements of the hydrogen spectrum by Gale, Monk, and Lee, while strongly confirming Richardson's allocation of the Q branches, has failed to yield confirmation of the remaining branches which he gives.

The present paper gives a number of combination relations which have been found to hold between the lines of the Fulcher Bands. These indicate that there are three main branches in each band, designated the R', Q, and P' branches, the Q branch being identical with that of Richardson. The R' and P' branches have a common initial level differing from that of the Q branch, while all three branches have a common final level. The arrangement yields term differences consistent throughout the bands.

As far as these term differences have been investigated, they have been found to be in agreement with the new mechanics.

The present investigation was suggested to me by Prof. H. Stanley Allen of St Andrews, and my warmest thanks are due to him for constant encouragement and helpful criticisms and suggestions.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 49 , 1930 , pp. 48 - 64
Copyright
Copyright © Royal Society of Edinburgh 1930

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References

page 48 note * Fulcher, G. S., Astrophys. Journ., vol. xxxvii, p. 60 (1913).CrossRefGoogle Scholar

page 48 note † Lenz, W., Verh. d. Phys., vol. xxi, p. 632 (1919).Google Scholar

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page 48 note ‖ Curtis, W. E., Roy. Soc. Proc., A, vol. cvii, p. 570 (1925).CrossRefGoogle Scholar

page 48 note ¶ Dieke, G. H., Proc. Kon. Akad. v. Wet. Amsterdam, vol. xxvii, p. 490 (1924).Google Scholar Dieke has also advanced further evidence in favour of this hypothesis based mainly on the relation of intensity of the Fulcher lines to temperature. See Zeits. für Physik, vol. xxxii, p. 180 (1925), and Phil. Mag., vol. 1, p. 173 (1925).

page 48 note ** Richardson, O. W., “Structure,” Parts IV and V, Roy. Soc. Proc., A, vol. cxi, p. 714 (1926)CrossRefGoogle Scholar, and vol. cxiii, p. 368 (1926).

page 49 note * Gale, H. G., Monk, G. S., and Lee, K. O., Astrophys. Journ., vol. lxvii, p. 89 (1928).CrossRefGoogle Scholar

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page 49 note ‡ Merton, T. R. and Barratt, S., “Bakerian Lecture” (1922).Google Scholar

page 49 note § Deodhar, D. B., Roy. Soc. Proc., A, vol. cxiii, p. 420 (1926).CrossRefGoogle Scholar

page 51 note * The new arrangement., in fact, implies a rejection of Fulcher's S5 and S6 as separate series.

page 51 note † Kratzer, A., Zeits.für Physik, vol. iii, p. 289 (1920)CrossRefGoogle Scholar, Phys. Zeits., vol. xxii, p. 552 (1921), and Ann. der Physik, vol. lxvii, p. 127 (1922).

page 52 note * Tanaka, (Roy. Soc. Proc., A, vol. cviii, p. 592 (1925)CrossRefGoogle Scholar) gives a weak line 18245·8.

page 52 note † Quoted in error as 18588·77 in Gale, Monk, and Lee's tables. The above agrees with their wave-length.

page 53 note * Lines recorded by M'Lennan, and Shrum, (Trans. Roy. Soc. Canada, vol. xviii, p. 177 (1924)Google Scholar) as strongly enhanced at low temperatures.

page 55 note * Recorded by M'Lennan and Shrum as greatly enhanced at low temperatures. (See note on Table III.)

page 57 note * This explanation indicates that the final state of the emitter is an S state, since the S states are rotationally single.

page 57 note † Mulliken, R. S., Phys. Rev., vol. xxx, p. 785 (1927).CrossRefGoogle Scholar

page 59 note * Mulliken, R. S., Phys. Rev., vol. xxviii, p. 481 (1926).CrossRefGoogle Scholar