Vibronic contributions to resonant NLO responses: two-photon absorption in push–pull chromophores

Two-photon absorption (TPA) spectra of push–pull chromophores are described in terms of a two-state model accounting for electron-vibration coupling. Vibrations have two main effects in TPA spectra. The most obvious one is the appearance of a vibrational structure in the spectrum; in this respect we...

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Bibliographic Details
Published inChemical physics letters Vol. 346; no. 5; pp. 470 - 478
Main Authors Painelli, Anna, Del Freo, Luca, Terenziani, Francesca
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 12.10.2001
Elsevier Science
Subjects
Atomic and molecular physics
Electric and magnetic moments (and derivatives), polarizability and magnetic susceptibility
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Molecular properties and interactions with photons
Nonlinear optics
Optical susceptibility, hyperpolarizability
Optics
Physics
Properties of molecules and molecular ions
Theoretical study
Vibronic interaction
Chromophores
Push pull compound
Herzberg Teller effect
Two photon absorption
Vibrational states
Nonlinear optics
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Summary:Two-photon absorption (TPA) spectra of push–pull chromophores are described in terms of a two-state model accounting for electron-vibration coupling. Vibrations have two main effects in TPA spectra. The most obvious one is the appearance of a vibrational structure in the spectrum; in this respect we find large Herzberg–Teller (HT) contributions. The second effect was not recognized so far: vibrational states contribute a new channel to TPA process, that shows up with a blue-shift and a distortion of the spectrum.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(01)00994-0