DEVELOPMENT OF CESIUM ATOM SUPPLY SYSTEM IN LIQUID NITROGEN FOR PRESSURE-DEPENDENT MEASUREMENT OF HYPERFINE STRUCTURE SPLITTING OF ATOMS IN SUPERFLUID HELIUM

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  • 超流動ヘリウム中原子の超微細構造間隔の圧力依存性測定に向けた液体窒素中へのCs原子供給システムの開発

Abstract

It is known that hyperfine structure energy splitting of atoms in superfluid helium (He II) is slightly different from that in vacuum. We have been developing a variable pressure vessel for laser RF/MW double resonance spectroscopy of Rb and Cs atoms in He II in order to measure the hyperfine structure splitting energy at different pressures and to clarify the effect of pressure on the interaction of atoms with He II. This study aims to develop a Cs atoms supply system in a variable pressure vessel for measurement of hyperfine structure splitting of cesium atoms in He II at various pressures ; however, as a pilot experiment, liquid nitrogen was used instead of He II in this study. First, the operation of laser-induced fluorescence (LIF) detection system using a photon counting method with a photomultiplier tube (PMT) was verified in a gas cell filled with Cs atoms. In an experiment using the ablation method to supply cesium atoms into a pressure-variable vessel filled with liquid nitrogen, emission from cesium atoms was confirmed. This result suggests that Cs atoms were supplied in a variable pressure vessel filled with liquid nitrogen.

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