Lin Ming-Fu, Tzeng Cheng-Ming, Dyakov Yuri A, Ni Chi-Kung
Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 10617, Taiwan.
J Chem Phys. 2007 Jun 28;126(24):241104. doi: 10.1063/1.2751150.
Photodissociation dynamics for various tryptophan chromophores was studied at 193 or 248 nm using multimass ion imaging techniques. The competition between internal conversion to the ground electronic state and dissociation from the repulsive excited state reveals size-dependent photostability for these amino acid chromophores. As the size of chromophore increases, internal conversion to the ground state becomes the major nonradiative process. For tryptophan and larger chromophores, dissociation directly from the repulsive state is completely quenched.
利用多质量离子成像技术，在193或248纳米波长下研究了各种色氨酸发色团的光解离动力学。向基态的内转换与从排斥激发态解离之间的竞争揭示了这些氨基酸发色团尺寸依赖性的光稳定性。随着发色团尺寸的增加，向基态的内转换成为主要的非辐射过程。对于色氨酸和更大的发色团，直接从排斥态解离的过程完全被淬灭。
