کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5361675 | 1388275 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photoisomerization dynamics study on cis-azobenzene derivative using ultraviolet-to-visible tunable femtosecond pulses
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We performed the transient absorption measurement and the first rate equation (RE) analysis for cis isomer of 4-carboxy-2â²,6â²-dimethylazobenzene to clarify the quantitative difference between the photoisomerization process and the thermal relaxation process from the S1C excited state. The RE analysis enabled us to determine the cis-to-trans photoisomerization rate per each pump pulse to be 3% under the condition of the 430Â nm, 150Â fs pump pulse with energy of 200Â nJ. Moreover, the signal due to the yielded trans molecules appearing in the transient absorption was assigned from the following observed result: the transient absorbance change at the 380Â nm probe mostly decreased within 300Â fs after the 430Â nm pulse pumping and then slowly decreased to zero, while the absorbance change at the 350Â nm probe had a positive constant component in the over one picosecond time region. The RE analysis showed that this constant component is due to the yielded trans molecules, and its positive value is due to the fact that the absorption cross-section of the S0T -to- S2T transition in their trans molecules is larger than that of the S0C -to- S2C transition in the original cis molecules.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 255, Issue 24, 30 September 2009, Pages 9864-9868
Journal: Applied Surface Science - Volume 255, Issue 24, 30 September 2009, Pages 9864-9868
نویسندگان
Atsushi Yamaguchi, Naoya Nakagawa, Kazumasa Igarashi, Taro Sekikawa, Hidenori Nishioka, Hiroyuki Asanuma, Mikio Yamashita,