Non-quadrupole lines in X-ray spectra

Deodhar, G. B. ; Mande, Chintamani (1952) Non-quadrupole lines in X-ray spectra Nature, 169 (4308). p. 889. ISSN 0028-0836

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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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