Long-Running-Time (T=0.45 K) Germanium Bolometer for Far Infrared Spectroscopy

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Abstract
A long-running-time (T=0.45 K) germanium bolometer which has a compact charcoal adsorption pump with a novel 3He gas condenser has been constructed. The refrigerator provides continuous cooling of the bolometer element at 0.45 K for 24-hour measurements of spectra in the range 2 to 40 cm-1. Utilizing this bolometer system, transmission spectroscopy has been carried out successively, maintaining the temperature of the sample below 40 K and that of the bolometer element below 1.5 K without a thermal cycle. This experimental setup is essential for obtaining a reproducible spectrum of MEM(TCNQ)2. Thus, each resultant spectrum has good reproducibility even after one-week-long experiments.