کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5376104 1504317 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrafast pump-probe spectroscopy of linear molecular aggregates: Effects of exciton coherence and thermal dephasing
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Ultrafast pump-probe spectroscopy of linear molecular aggregates: Effects of exciton coherence and thermal dephasing
چکیده انگلیسی
We model the pump-probe spectrum of linear molecular aggregates measured by using ultrafast laser pulses. We analyze in particular the effects of coherences between exciton states created by the pump pulse and show that these give rise to a small induced-absorption peak that is red-shifted relative to the main one-exciton bleaching peak. The new coherent peak survives common values of the static disorder. With increasing pump-probe delay time, its amplitude oscillates and decays with a rate that is inversely proportional to the width of the absorption band. We also consider coupling to vibrations and show that with increasing temperature the frequency separation between the main bleaching and induced-absorption peaks increases and provides a measure for the exciton coherence size imposed by scattering on the vibrations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 341, Issues 1–3, 15 November 2007, Pages 230-239
نویسندگان
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