Title of article :
Photoisomerization dynamics study on cis-azobenzene derivative using ultraviolet-to-visible tunable femtosecond pulses
Author/Authors :
Atsushi Yamaguchi، نويسنده , , Naoya Nakagawa، نويسنده , , Kazumasa Igarashi، نويسنده , , Taro Sekikawa، نويسنده , , Hidenori Nishioka، نويسنده , , Hiroyuki Asanuma، نويسنده , , Mikio Yamashita، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
5
From page :
9864
To page :
9868
Abstract :
We performed the transient absorption measurement and the first rate equation (RE) analysis for cis isomer of 4-carboxy-2′,6′-dimethylazobenzene to clarify the quantitative difference between the photoisomerization process and the thermal relaxation process from the image 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 430 nm, 150 fs pump pulse with energy of 200 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 380 nm probe mostly decreased within 300 fs after the 430 nm pulse pumping and then slowly decreased to zero, while the absorbance change at the 350 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 image -to- image transition in their trans molecules is larger than that of the image -to- image transition in the original cis molecules.
Keywords :
Azobenzene derivative , Rate equation analysis , Ultrafast photoisomerization dynamics , Transient absorption measurement
Journal title :
Applied Surface Science
Serial Year :
2009
Journal title :
Applied Surface Science
Record number :
1012366
Link To Document :
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