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Abstract: The pure rotational spectra of the ground and five excited vibrational states of pyridine were measured, assigned and fit in the 75–110 and 260–370GHz frequency bands. An improved set of spectroscopic constants was obtained for the ground state, and all the rotational and quartic centrifugal distortion constants were obtained for the excited vibrational states. [Copyright &y& Elsevier]

Describes the development of a fast scan submillimeter spectroscopic technique which uses a voltage tunable backward wave oscillator (BWO) as a primary source of radiation. Basic spectroscopic system; Key system elements; System attributes; Tube characteristics; Frequency calibration scheme; Power supply scheme; BWO frequency-voltage characteristic.

Abstract: Previous work involving the rotational spectrum of aniline was limited to the lower frequencies of 8–40GHz with very few lines being assigned. This work extends the earlier studies. Here we present a much more extensive measurement and assignment of the rotational spectrum of aniline in the frequency range of 75–110GHz. The observed frequencies have been assigned to the ground (0+), first (0−), and second excited (1+) states in the inversion vibration. With the newly assigned lines, significantly improved rotational constants and all five centrifugal distortion constants have been obtained. [Copyright &y& Elsevier]