Study on photo-induced dynamics of the positronium negative ion

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17705
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: National Institute of Advanced Industrial Science and Technology (2017); Tokyo University of Science (2016)
• Principal Investigator: Michishio Koji 国立研究開発法人産業技術総合研究所, 計量標準総合センター, 研究員 (10710840)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: ポジトロニウム負イオン / 光脱離 / レーザー分光 / 原子・分子物理 / 陽電子

Outline of Final Research Achievements

In the present study, we performed a measurement of the photodetachment cross-section of the positronium negative ion, a bound state of two electrons and one positron, aimed at revealing its dynamics. The cross-section at a wavelength of 1064 nm was determined by measuring the yield of positronium atoms formed via photodetachment as a function of the laser power. Additionally the electron affinity of the ion was also determined by employing recoil momentum spectroscopy with the light polarization.

Free Research Field

量子ビーム