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Recent spectroscopic observations by sensitive radio telescopes requireaccurate molecular spectral line frequencies to identify molecular species in aforest of lines detected. To measure rest frequencies of molecular spectrallines in the laboratory, an emission-type millimeter and submillimeter-wavespectrometer utilizing state-of-the-art radio-astronomical technologies isdeveloped. The spectrometer is equipped with a 200 cm glass cylinder cell, atwo sideband (2SB) Superconductor-Insulator-Superconductor (SIS) receiver inthe 230 GHz band, and wide-band auto-correlation digital spectrometers. Byusing the four 2.5 GHz digital spectrometers, a total instantaneous bandwidthof the 2SB SIS receiver of 8 GHz can be covered with a frequency resolution of88.5 kHz. Spectroscopic measurements of CH$_3$CN and HDO are carried out in the230 GHz band so as to examine frequency accuracy, stability, sensitivity, aswell as intensity calibration accuracy of our system. As for the result ofCH$_3$CN, we confirm that the frequency accuracy for lines detected withsufficient signal to noise ratio is better than 1 kHz, when the high resolutionspectrometer having a channel resolution of 17.7 kHz is used. In addition, wedemonstrate the capability of this system by spectral scan measurement ofCH$_3$OH from 216 GHz to 264 GHz. We assign 242 transitions of CH$_3$OH, 51transitions of $^{13}$CH$_3$OH, and 21 unidentified emission lines for 295detected lines. Consequently, our spectrometer demonstrates sufficientsensitivity, spectral resolution, and frequency accuracy for in-situexperimental-based rest frequency measurements of spectral lines on variousmolecular species.

Spectrometer Using superconductor MIxer Receiver (SUMIRE) for Laboratory Submillimeter Spectroscopy