PURPOSE: To remove measuring noises caused by bubbles generated from a cryogen during the measurement, by setting a sample chamber on the side of a cryostat body while a sample base as heat good conductor is provided in the sample chamber.
CONSTITUTION: A cryostat body 11 is filled with a liquid nitrogen 103 as refrigerant. A sample chamber 12 sticks out horizontally from the side of the body 11. A copper sample base 13 as heat good conductor having a sample 105 thereon is inserted into the sample chamber 12. Without the sample base 13, the sample chamber 12 will not be cooled as exposed to radiation heat from outside. The horizontal layout of the sample 105 eliminates the need for a specified fixed means. Furthermore, as the sample chamber 12 is of a lateral type, a passage 14 of a vapor gas is formed in the sample 105 so constant as to generate bubbles 113 only on the side of the body 11. Thus, there is no bubble intercepting the optical path of the excitation light 15 intermittently thereby eliminating noises during the measurement.
SUHARA MOTOI
MUTO YUHEI
