Winstead Carl, McKoy Vincent
A.A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA.
Phys Rev Lett. 2007 Mar 16;98(11):113201. doi: 10.1103/PhysRevLett.98.113201. Epub 2007 Mar 13.
Detailed investigation of the three low-energy resonances seen in electron scattering by the diazabenzene molecule pyrazine reveals that the first two are nearly pure single-channel shape resonances, but the third is, as long suspected, heavily mixed with core-excited resonances built on low-lying triplet states. Such resonant channel coupling is likely to be widespread in pi-ring molecules, including the nucleobases of DNA and RNA, where it may form a pathway for radiation damage.
对二氮苯分子吡嗪在电子散射中观察到的三个低能共振进行的详细研究表明，前两个共振几乎是纯单通道形状共振，但第三个共振正如长期以来所怀疑的那样，与基于低激发三重态的核激发共振强烈混合。这种共振通道耦合可能在π环分子中广泛存在，包括DNA和RNA的核碱基，在那里它可能形成辐射损伤的一条途径。
