Now, in this fifth edition of the book, which covers advances in the field over the last seven years, a new co-author has been added. Thomas Lauritsen, Caltech professor of physics, has rewritten the final chapters on cosmic rays and nuclear physics, which now include material on some of the newly-discovered fundamental particles, while Professor Kennard has brought the remainder of the book up to date by rewriting, rearangement and abbreviation of older material, to reflect the further change in perspective in the physical scene.
Molecular constants for CsF, CsCl, and CsBr have been determined from measurements of their pure rotational spectra in the microwave region. These and other data allow a test of the constancy of ionic bonding radii. Measurements of isotopic species of these molecules give the mass ratios of the stable CI and Br isotopes.
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