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.
By means of the two-crystal ionization spectrometer measurements have been made of the wavelengths and intensities relative to Ka\ of the satellites Kaz,4 of Cu (29). Kct3,4 has characteristics of a doublet and is separated, photographically, for elements below Sc(21) but is unresolved for elements of higher atomic number. The greater resolving power of the two-crystal spectrometer shows that this "doublet" contains, probably, more than the two components ^0:3 and Ka\, the wavelengths of which latter were found, respectively, to be 1531.15 and 1530.15 X.U. The intensity of either of these components, at 40 K.V., is of the order of 0.25 percent of the intensity of Ka\. A similar study of the Ka Z A doublet of Ni (28) suggests that this doublet may contain four components.
Mass absorption coefficients for wave-lengths on both sides of the K limit. (l) Experimental results for six metals. Using a water cooled Mo tube, absorption measurements were made for a sufficient range of wave-lengths in each case to determine the constants in the equations for the mass absorption coefficients above and below the K absorption discontinuity. /X K /P = KKA 3 -f-tr/p; ^L/P = KKA 3 +O-//>, in which a/p is the scattering coefficient, with a value of 1 or less. X is in angstrom units. r a is the atomic absorption coefficient at the K limit, corrected for scattering. &K = &L = &K/&L = -adO-21 ) = Mo(42) 375 50 7.5 13.3
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