Download Atomic Spectra and Radiative Transitions by Professor Dr. Igor I. Sobelman (auth.) PDF

By Professor Dr. Igor I. Sobelman (auth.)

Atomic Spectra and Radiative Transitions covers the systematics of atomic spectra, non-stop spectrum radiation, and the excitation of atoms. This moment variation has extra chapters on relativistic corrections within the spectra of hugely charged ions, which rounds off the former therapy. broad tables of oscillator strengths (both dipole and quadrupole), percentages and go sections of radiative transitions whole this textbook, making it valuable additionally as a reference work.

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Extra info for Atomic Spectra and Radiative Transitions

Example text

As a rule, the levels of atoms of the beginning and middle of the periodic systems of elements, which correspond to lower excited states, are well described in the L S coupling approximation. This approximation, however, is not applicable to highly excited levels of atoms. States in which one of the electrons is on the average at a great distance from the nucleus and from the remaining electrons of the atom correspond to these levels. The electrostatic interaction of the electrons of an atomic core with the outer electron is small in comparison with their spin-orbit interaction.

1. 1. Terms of /" configurations Configuration 2S s P p2 d d2 d' Statistical weight Terms s2 p' p5 p' d9 d' d" 2 IS ISD 2PDO 2D ISDG 2PDFGH 'PF 'PF ISDFGI 'PDFGH5D 2 2 2 d' 1 6 15 20 10 45 120 2j>Q 2 • 210 2 2SPDFGHI 3 252 2 2 111 2£0 ISDGI 2PDFGHIKLO 'PFH 'SDFGIO r /,0 ISDFGHIKLN 'PDFGHIKLM 5SDFGI 1001 f5 P 2PDFGHIKLMNOO 'SPDFGHIKLM06PFHO 2002 f6 f6 ISPDFGHIKLMNQ 'PDFGHIKLMNO 7F 3003 I 113 P f2 /,2 2 2 2 2 24 4232 "57615532 4 648411422 14 91 364 2 3 •• 3 , 2 6597966, 3 'SPDFGHIKL 3 2 , f' 2SPDFGHIKLMNOQO 2 , 7 10 10 9 9 7 5 • 2 2 2 'SPDFGHIKLMN0 2265755" ISO 3432 6PDFGHIO The statistical weight of the configuration (total number of states pertaining to the given configuration) is shown in the last column of this table.

Shells with n = 4,5,6 are denoted by the letters N, 0, P. 1 Spectral Terms. , by the assignment of the values of n and I for all the electrons. , na/a, n3/3' ... there correspond 2(2/1 + I) 2(2/a + I) 2(2/3 + I) ... states, differing by the values of the quantum numbers m, and m, or, in other words, by the mutual orientation of the orbital angular momenta and spins of the electrons. Attributing all these states to one and the same energy level of an atom is possible as long as we neglect that part of the electrostatic interaction between electrons which is not taken into account in a centrally symmetric approximation, and also spin-orbit interaction.

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