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.

引用

页数：6

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