Abstract
IT is well known that, by giving prolonged exposures, many forbidden lines appear in X-ray emission spectra violating the dipole selection rules derived from theory. Most of the forbidden lines obey the quadrupole selection rules, namely, δl = 0, ± 1, ± 2 and δj = 0, ± 1, ± 2, except l = 0 to l = 0, and j = 0 to j = 0 and j = ½ to j = ½. Some workers have, however, noticed a few forbidden lines which even violate the quadrupole selection rules and which cannot be explained by any multipole radiation theory. Such lines are generally known as ‘non-quadrupole’ lines.
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References
Deodhar, G. B., and Mande, C., J. Sci. Indust. Res., 9 B, 263 (1950); 10 B, 260 (1951); 11 B, 1 (1952).
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DEODHAR, G., MANDE, C. Non-Quadrupole Lines in X-Ray Spectra. Nature 169, 889 (1952). https://doi.org/10.1038/169889a0
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DOI: https://doi.org/10.1038/169889a0
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