Wide-range millimeter-wave spectrometer for high-resolution investigation of molecular rotational spectra

This paper contains the brief description of the essential improvement of the automated millimeter-wave spectrometer previously described by Alekseev (1995). This spectrometer is built according to the so-called "classic scheme", i.e. radiation from a scanning source passes through an absorbing cell containing investigated gas inside, and then is received by a receiving system. A computer-controlled millimeter-wave frequency synthesizer is used as the scanning radiation source. The spectrometer was intended for high-resolution detail spectral investigations only. However for initial studies of molecular rotational spectra it is necessary to record very wide frequency ranges. For this purpose we have undertaken modernization of the spectrometer hardware and software. The results of such modernization are presented.