Resonant Annihilation and Positron Bound States in Benzene

被引：6
作者：
Ghosh, S. [1 ]
Danielson, J. R. [1 ]
Surko, C. M. [1 ]
机构：
[1] Univ Calif San Diego, Phys Dept, La Jolla, CA 92093 USA
来源：
PHYSICAL REVIEW LETTERS | 2022年 / 129卷 / 12期
基金：
美国国家科学基金会;
关键词：
ATTACHMENT; MOLECULES;
D O I：
10.1103/PhysRevLett.129.123401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Positrons attach to molecules in vibrationally resonant two-body collisions that result in greatly enhanced annihilation rates. Measurements of annihilation as a function of positron energy are presented for benzene using a cryogenic, trap-based beam. They establish a positron binding energy of 132 +/- 3 meV to test state-of-the-art theoretical calculations, and they exhibit many unexpected resonances, likely due to combination and overtone vibrational modes. The relationship of these results to the unique pi-bonded structure of benzene is discussed.
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页数：6
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