Geodesic
Theory of two-exciton absorption of light with allowance for lattice vibrations
Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 1, pp. 116-127

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A study is made of the two-exciton absorption of light in molecular crystals at nonzero temperatures. A unitary transformation is proposed that enables one to diagonalize partly the energy operator of the crystal and investigate directly the cases of both strong and weak exciton-phonon coupling. For the case of strong coupling, the temperature dependences of the line intensity for double absorption and the energy distance between lines of a permutational doublet are obtained. Allowance for the exciton-phonon interaction also leads to the possible appearance of new lines. Formulas are obtained for the coefficient of absorption of light by a crystal in the frequency range corresponding to the excitation of two Frenkel excitons and phonons. 
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     author = {Yu. B. Gaididei and V. M. Loktev},
     title = {Theory of two-exciton absorption of light with allowance for lattice vibrations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_16_1_a12/}
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Yu. B. Gaididei; V. M. Loktev. Theory of two-exciton absorption of light with allowance for lattice vibrations. Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 1, pp. 116-127. http://geodesic.mathdoc.fr/item/TMF_1973_16_1_a12/