DuMond, Jesse W. M. (1961) Absence of Dispersive Properties of Space for Electromagnetic Radiation Tested to ± 14 x 10^-5; Comments on a Proposal of Softky and Squire. Proceedings of the National Academy of Sciences of the United States of America, 47 (3). pp. 347-348. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:DUMpnas61
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:DUMpnas61
In session I 1 of the Berkeley meeting of December 30, 1960, S. D. Softky and R. K. Squire proposed a test for dispersive properties of space for electromagnetic radiation by detonating a nuclear explosive at a distance of 10^6 miles from the earth and noting the arrival times of different types of radiation at detectors above the atmosphere. The purpose of this note is to point out that Softky and Squire have overlooked the fact that a test for the dispersive properties they postulate already exists, covering perhaps not quite as extensive a range of the electromagnetic spectrum as they hope to cover (they claim a factor of 10^11) but nevertheless sufficient to render any such effect extremely unlikely over a range of frequencies of a factor of 5 X 10^9. I refer to a measurement performed in 1950 by means of the bent quartz crystal diffraction spectrometer  of the wavelength of the annihilation radiation generated in a block of copper by positrons from the nuclide 64Cu.
|Additional Information:||Copyright © 1961 by the National Academy of Sciences Communicated January 17, 1961 Work performed under the auspices of the U.S. Atomic Energy Commission.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||28 Nov 2006|
|Last Modified:||14 Nov 2014 19:19|
Repository Staff Only: item control page