Role of binding energy in Feshbach-resonant positron-molecule annihilation.
Role of binding energy in Feshbach-resonant positron-molecule annihilation.
复制标题
结合能在费什巴赫共振正电子分子湮灭中的作用。
DOI：
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发表时间：
2007
影响因子：
8.6
通讯作者：
C. Surko
中科院分区：
文献类型：
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作者：
J. Young;C. Surko
正电子-非分子湮灭的测量已经确定，正电子通过振动费什巴赫共振与各种分子结合。用苯和1-氯己烷的深束缚态和烷烃的正电子激发（即第二）束缚态的数据来建立湮灭速率与结合能和入射正电子能的依赖关系。去掉这种依赖关系后，一大批分子的湮灭率就呈现在一条与分子振动自由度数目有关的通用曲线上。讨论了这些结果对理论模型的影响。
Measurements of positron-on-molecule annihilation have established that positrons bind to a variety of molecules via vibrational Feshbach resonances. Data for deeply bound states in benzene and 1-chlorohexane and for positronically excited (i.e., second) bound states in alkanes are used to establish the dependence of annihilation rates on the binding energy and incident positron energy. With this dependence removed, annihilation rates for a broad class of molecules lie on a universal curve as a function of the number of molecular vibrational degrees of freedom. The implications of these results for theoretical models are discussed.