کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5375946 | 1504309 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reaction path dependent coherent wavepacket dynamics in excited state intramolecular double proton transfer
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The primary steps and the wavepacket dynamics of the ultrafast photoinduced double proton transfer in (2,2â²-bipyridyl)-3,3â²-diol are observed. A two-color pump probe spectrometer with 30Â fs time resolution allows the variation of the vibrational excess energy. We find that the first step of the sequential proton transfer and the concerted double proton transfer both proceed in about 50Â fs. We observe two types of coherently excited vibrational modes: (i) two symmetric stretching modes are closely associated with the concerted double proton transfer indicating that a simultaneous and symmetric reduction of the donor acceptor distances in both chelate rings takes place during the transfer; (ii) a nonsymmetric in-plane-bending mode is associated with the sequential proton transfer and provides evidence that the transient reduction of the donor acceptor distance occurs only in one chelate ring. This mode is exclusively excited by the reaction and cannot be excited optically according to symmetry selection rules. This constitutes a direct proof that a vibrational wavepacket can be excited by an ultrafast reaction itself.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 349, Issues 1â3, 16 June 2008, Pages 197-203
Journal: Chemical Physics - Volume 349, Issues 1â3, 16 June 2008, Pages 197-203
نویسندگان
Kai Stock, Christian Schriever, Stefan Lochbrunner, Eberhard Riedle,