Abstract
We have developed a novel and simple technique to control the temperature and pressure of cold helium gas independently in a designated space above liquid helium. The technique functions through adjustment of both the pumping speed of helium gas and the evaporation of liquid helium using a heater immersed in the liquid helium. This technique enables us to investigate the peculiar temperature dependence of collision cross sections of Ba+* and He, or Ba+*‐He and He at temperatures of 3–30 K through observation of laser‐induced fluorescence spectra of Ba+*‐He, or exciplexes.
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