Publications (2)3.09 Total impact
-
Article: Excited state hydrogen transfer dynamics in substituted phenols and their complexes with ammonia: ππ*-πσ* energy gap propensity and ortho-substitution effect.
[show abstract] [hide abstract]
ABSTRACT: Lifetimes of the first electronic excited state (S(1)) of fluorine and methyl (o-, m-, and p-) substituted phenols and their complexes with one ammonia molecule have been measured for the 0(0) transition and for the intermolecular stretching σ(1) levels in complexes using picosecond pump-probe spectroscopy. Excitation energies to the S(1) (ππ*) and S(2) (πσ*) states are obtained by quantum chemical calculations at the MP2 and CC2 level using the aug-cc-pVDZ basis set for the ground-state and the S(1) optimized geometries. The observed lifetimes and the energy gaps between the ππ* and πσ* states show a good correlation, the lifetime being shorter for a smaller energy gap. This propensity suggests that the major dynamics in the excited state concerns an excited state hydrogen detachment or transfer (ESHD/T) promoted directly by a S(1)/S(2) conical intersection, rather than via internal conversion to the ground-state. A specific shortening of lifetime is found in the o-fluorophenol-ammonia complex and explained in terms of the vibronic coupling between the ππ* and πσ* states occurring through the out-of-plane distortion of the C-F bond.The Journal of chemical physics 09/2010; 133(12):124313. · 3.09 Impact Factor -
Conference Proceeding: Narrow-bandwidth Mid-IR generation based on a large aperture periodically poled Mg-doped LiNbO3 optical parametric pump system
[show abstract] [hide abstract]
ABSTRACT: We have developed a narrow-bandwidth (<2 cm<sup>-1</sup>) mid-IR optical parametric system with a large-aperture PPMgLN based 2 mum pump system. The system tuned from 4.7 to 10.6 mum, and the maximum output energy of 1.7 mJ was obtained.Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science. CLEO/QELS 2008. Conference on; 06/2008
Top co-authors
Top Journals
Institutions
-
2010
-
Tokyo Institute of Technology
Tokyo, Tokyo-to, Japan
-
