Absolute optical absorption cross-section measurement of Rb atoms injected into superfluid helium using energetic ion beams. (20th December 2018)

• Record Type: Journal Article
• Authors: Imamura, Kei; Matsuo, Yukari; Kobayashi, Wataru; Egami, Tsuyoshi; Sanjo, Makoto; Takamine, Aiko; Fujita, Tomomi; Tominaga, Daiki; Nakamura, Yutaro; Furukawa, Takeshi; Wakui, Takashi; Ichikawa, Yuichi; Nishibata, Hiroki; Sato, Tomoya; Gladkov, Aleksey; Tao, Long Chun; Kawaguchi, Takafumi; Baba, Yosuke; Iijima, Mari; Gonda, Haruka; Takeuchi, Yasuharu; Nakazato, Rio; Odashima, Hitoshi; Ueno, Hideki
• Is Part Of: Applied physics express. Volume 12:Number 1(2019)
• Publication Date: 2018-12-20
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/1882-0786/aaf0a9
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We report on a new in situ laser spectroscopy technique using superfluid helium and a highly energetic ion beam. In taking advantage of superfluid helium as a host matrix for laser spectroscopy, we were able to develop an extremely low background detection system. The first demonstration using 85 Rb 31+ ion beam (66 MeV/nucleon) accelerated at the RIKEN accelerator facility shows improvement of detection limit by two orders of magnitude. A quantitative evaluation of Rb atoms in the observation region enables an analysis of their optical absorption cross-section in superfluid helium from the fluorescence intensity dependence on ion-beam intensity and applied laser power.