High resolution laser spectroscopy of metallic atoms and molecules: Storage of singly and doubly charged ions transferred from externally generated laser plasmas |
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Authors: | Yukari Matsuo Haruka Maeda Michio Takami |
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Institution: | (1) RIKEN (The Institute of Physical and Chemical Research), 351-01 Wako, Saitama, Japan;(2) Faculty of Engineering, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan |
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Abstract: | A radio-frequency (RF) ion trap has been constructed for high resolution laser spectroscopy of metallic ions. Ions in externally
generated laser plasma have been directly introduced into the RF ion trap. An Nd:YAG laser is used to vaporize and ionize
sample metals placed behind a ring electrode. Both hyperbolic and cylindrical electrodes are successfully used for confinement
of the ions. Trapped ions are detected either with a quadrupole mass spectrometer or with a photomultiplier for the measurement
of laser-induced fluorescence. Metallic ions such as Ca+, Ba+, La+, Nd+, Tm+, Lu+, and Ta+ have been confined for the time range of several to 20 minutes in the presence of He buffer gas, and a doubly charged ion
Ba2+ for several seconds. Some ions like Nd+, Lu+, Hf+, and Ta+ are found to be highly reactive with background gaseous molecules. |
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