کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5375902 1504311 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of ultrafast relaxation in photoexcited DNA base pairs of adenine and thymine
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Analysis of ultrafast relaxation in photoexcited DNA base pairs of adenine and thymine
چکیده انگلیسی
The photoinduced dynamics in base pairs of adenine and thymine were analyzed by femtosecond pump-probe spectroscopy. On the short-time scale up to a few picoseconds, the characteristic time constants for the dimers are quite similar to the corresponding values of the monomers. This leads to the conclusion that ultrafast intramolecular relaxation proceeds via ππ∗ and nπ∗ states of one component within the dimer. On the long-time scale, we obtained a novel time constant of roughly 40 ps for the thymine dimer and the adenine-thymine base pair. This time constant was never observed in the monomers and is tentatively assigned to an intermolecular relaxation process, possibly via a hydrogen transfer state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 347, Issues 1–3, 23 May 2008, Pages 376-382
نویسندگان
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