Aravind G, Lammich L, Andersen L H
Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Jan;79(1 Pt 1):011908. doi: 10.1103/PhysRevE.79.011908. Epub 2009 Jan 15.
The doubly deprotonated [Asn,Val5] angiopeptide, in the gas phase, was irradiated with 266 nm photons. The time of flight (TOF) of the products formed following photoabsorption, namely, the monoanion and neutral fragments, was recorded with submicrosecond time resolution. Monte Carlo simulations of the TOF of the neutral fragments indicate that the dissociation occurs faster than 100 ns. A similar experiment performed on the Val5 angiopeptide also yielded a dissociation time shorter than 100 ns. We suggest dissociation mechanisms that account for the different number of photons required for the release of CO2.
在气相中，用266纳米的光子辐照双去质子化的[天冬酰胺，缬氨酸5]血管肽。记录光吸收后形成的产物（即单阴离子和中性碎片）的飞行时间（TOF），时间分辨率为亚微秒。对中性碎片飞行时间的蒙特卡罗模拟表明，解离发生的速度快于100纳秒。对缬氨酸5血管肽进行的类似实验也得到了短于100纳秒的解离时间。我们提出了解离机制，该机制解释了释放二氧化碳所需的不同光子数。
