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Shape of the Modified Compton Line for Hydrogen and Ceylon Graphite Scatterers

Shape of the Modified Compton Line for Hydrogen and Ceylon Graphite Scatterers Hydrogen under ten atmospheres pressure was used to scatter almost directly backward the characteristic K radiation of a molybdenum-target x-ray tube. After an exposure of 1914 hours in a focusing curved-quartz-crystal spectrograph the resulting modified line was studied with a microphotometer. The breadth of the composite modified line of the alpha-doublet was 15.2 x.u. This is ten percent greater than the breadth computed by B. Hicks from the electron momentum distribution. That the discrepancy is greater for H 2 than for the previously studied He is probably because the H 2 calculations were not carried to so high a degree of approximation. The unmodified line was completely absent. The shift as determined by fluorescence reference lines is less than that required for free electrons by an amount appropriate to the binding energy of electrons in the H 2 molecule. A renewed search was made for evidence of any departure of the electron momenta from an isotropic directional distribution in Ceylon graphite, a diamagnetic crystal. This time the diamagnetic axis of the graphite was placed normal to the direction along which the experiment resolves the electron velocities. There was no indication of two lines or prominences symmetrically disposed on either side of the center of the Compton line corresponding to shifts for the directly approaching and receding electrons. A small error in the previous determination of the shift defect for helium is noted. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Shape of the Modified Compton Line for Hydrogen and Ceylon Graphite Scatterers

Kirkpatrick, H. A
Physical Review , Volume 54 (10) – Nov 15, 1938
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1938 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.54.802
Publisher site
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Abstract

Hydrogen under ten atmospheres pressure was used to scatter almost directly backward the characteristic K radiation of a molybdenum-target x-ray tube. After an exposure of 1914 hours in a focusing curved-quartz-crystal spectrograph the resulting modified line was studied with a microphotometer. The breadth of the composite modified line of the alpha-doublet was 15.2 x.u. This is ten percent greater than the breadth computed by B. Hicks from the electron momentum distribution. That the discrepancy is greater for H 2 than for the previously studied He is probably because the H 2 calculations were not carried to so high a degree of approximation. The unmodified line was completely absent. The shift as determined by fluorescence reference lines is less than that required for free electrons by an amount appropriate to the binding energy of electrons in the H 2 molecule. A renewed search was made for evidence of any departure of the electron momenta from an isotropic directional distribution in Ceylon graphite, a diamagnetic crystal. This time the diamagnetic axis of the graphite was placed normal to the direction along which the experiment resolves the electron velocities. There was no indication of two lines or prominences symmetrically disposed on either side of the center of the Compton line corresponding to shifts for the directly approaching and receding electrons. A small error in the previous determination of the shift defect for helium is noted.

Journal

Physical Review – American Physical Society (APS)

Published: Nov 15, 1938

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