Calculation of two-photon absorption spectra of monosubstituted benzenes with accounting for the Herzberg-Teller effect

A calculation was carried out of relative line intensities of two-photon absorption spectra of fluoro- and chlorobenzene in the¹A₁¹B₁ transition region. The separate aspects of the calculation procedure used are discussed, which is based on the concept of the matrix element of a transitional dipole moment in the Herzberg—Teller approximation and was previously successfully applied to electron-absorption and resonance Raman spectra. A satisfactory correspondence between the calculation results and the experimental data has been found.Saratov State Pedagogical Institute. Translated from Zhurnal Strukturnoi Khimii, Vol. 34, No. 1, pp. 101–104, January–February, 1993.