Plasma and Fusion Research
Volume 14, 1201021 (2019)
Rapid Communications
- 1)
- Department of Physics, Sophia University, Tokyo 102-8554, Japan
- 2)
- RIKEN Nishina Center, Saitama 351-0198, Japan
- 3)
- Institute for Laser Science, The University of Electro-Communications, Tokyo 182-8585, Japan
- 4)
- Wako Nuclear Science Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Saitama 351-0198, Japan
- 5)
- Quantum Metrology Laboratory, RIKEN, Saitama 351-0198, Japan
- 6)
- RIKEN Center for Advanced Photonics, Saitama 351-0198, Japan
- 7)
- Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
Abstract
We observed and directly measured the M1 transition between the two states of the fine structure splitting in the ground state of Ba7+ with a visible spectrometer coupled to a compact electron beam ion trap. To validate the measurement accuracy, we demonstrated a calibration method using Ar+ emissions from buffer gas. The wavenumber in vacuum was determined to be 23591.57 (15) cm−1.
Keywords
visible spectroscopy, highly charged ion, electron beam ion trap, calibration
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