Chronology of Milestone Events in Particle Physics - COMPTON 1923
Chronology of Milestone Events in Particle Physics

  Nobel prize to A. H. Compton awarded in 1927 "for his discovery of the effect named after him''. Co-winner C. T. R. Wilson "for his method of making the paths of electrically charged particles visible by condensation of vapour''  


Compton, A.H.;
The Spectrum of Scattered X Rays
Phys. Rev. 22 (1923) 409;

Full text
English: PDF TeX

Reprinted in
Great Experiments in Physics (Henry Holt and Company, New York, 1960) edited by M. H. Shamos.
The WORLD of the ATOM, editors H. A. Boorse and L. Motz, Basic Books, New York - London, V.2 (1966) 911.
The Physical Review - the First Hundred Years, AIP Press (1995) CD-ROM.

The spectrum of molybdenum K rays scattered by graphite at 45, 90 and 135 has been compared with the spectrum of the primary beam. A primary spectrum line when scattered is broken up into two lines, an "unmodified'' line whose wave-length remains unchanged, and a "modified'' line whose wave-length is greater than that of the primary spectrum line. Within a probable error of about 0.001 , the difference in the wave-lengths ( - 0) increases with the angle between the primary and the scattered rays according to the quantum relation ( - 0) = (1 - cos), where = h/mc = 0.0242 . This wave-length change is confirmed also by absorption measurements. The modified ray does not seem to be as homogeneous as the unmodified ray; it is less intense at small angles and more intense at large angles than is the unmodified ray.
An X ray tube of small diameter and with a water-cooled target is described, which is suitable for giving intense X rays.

Accelerator XRAY-TUBE Detectors SPEC

Related references
See also
A. H. Compton, Phys. Rev. 21 (1923) 483;
P. Debye, Phys.Zeitschr. 24 (1923) 161;
A. H. Compton, Phys. Rev. 21 (1923) 207;

  C C angp

Record comments
Direct experimental confirmation that the photon is an elementary particle, the Compton effect.
  New Comments List of Comments xhyioopo