کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5376488 1389362 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vibronic spectra of charge transfer excitons and of mixed charge transfer and Frenkel excitons
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Vibronic spectra of charge transfer excitons and of mixed charge transfer and Frenkel excitons
چکیده انگلیسی
The linear absorption spectra in the excitonic and vibronic regions in the case of mixing of Frenkel excitons (FEs) and charge-transfer excitons (CTEs) have been theoretically studied for the exciton parameters of the crystals of MePTCDI and PTCDA. Two coupling parameters for the exciton-phonon coupling are introduced: the FE-phonon coupling and the CTE-phonon coupling. The main features of the vibronics in the absorption spectra are the following: (a) the existence of a doublet structure in the vibronic spectra of CTEs; (b) the vibronic levels of the FE at intermediate values of both coupling parameters are located in the continuum of the many-particle exciton-phonon states which makes its absorption line wide and flat; (c) in the case of strong coupling (coupling constants larger than 1) a doublet of bound states appears above this continuum; (d) in the case of vanishing CTE-phonon coupling the vibronics of the charge transfer excitons practically disappear in the absorption spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 332, Issue 1, 25 January 2007, Pages 108-114
نویسندگان
, , ,