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Direct Wavelength Measurement of the Visible M1 Transition in Ba⁷⁺ with a Novel Calibration Method

Naoki KIMURA^1,2), Ryunosuke KODAMA³⁾, Kento SUZUKI³⁾, Shimpei OISHI³⁾, Michiharu WADA⁴⁾, Kunihiro OKADA¹⁾, Noriaki OHMAE^5,6), Hidetoshi KATORI^5,6,7) and Nobuyuki NAKAMURA³⁾

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

(Received 18 November 2018 / Accepted 30 November 2018 / Published 23 January 2019)

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.

Copyright (c) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

visible spectroscopy, highly charged ion, electron beam ion trap, calibration

DOI: 10.1585/pfr.14.1201021

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