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“Dissolution” of 4f–4f transitions in phonon sidebands (ZnS:Tm 3+ )
Author(s) -
Boyn R.,
Zimmermann H.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221400118
Subject(s) - sideband , stark effect , excitation , atomic physics , spectral line , phonon , helium , dissolution , chemistry , emission spectrum , physics , condensed matter physics , quantum mechanics , microwave
For the example of the 1 G 4 → 3 H 6 emission spectra of two Tm 3+ centers in ZnS crystals (measured by means of dye‐laser site‐selective excitation at helium temperature) it is shown that lines arising from transitions to higher Stark levels of a given manifold may “dissolve” in the phonon sideband of the transitions to lower Stark levels. This phenomenon, which involves a transfer of intensity from lines to sidebands, is discussed quantitatively by applying Fano's general theory of continuum–discrete level interaction, as formulated by Shibatani and Toyozawa, to this vibronic problem. On this basis the large sideband‐intensities observed may be understood for the present systems. Furthermore, the dissolution effect can, at least partly, explain the general observation that transitions to higher Stark levels tend to have smaller apparent intensities than those to the lowest Stark levels.