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We provide compelling experimental and theoretical evidence for the transition state nature of the cyclopropyl cation.

We report on the theoretical and experimental investigation of the CH2OH radical pure rotational spectrum in the (sub-)millimeter wave domain.

We report on the development of a sub-MHz resolution THz spectrometer exploiting heterodyne mixing of synchrotron radiation and a THz molecular laser.

We report a joint pure rotational and ro-vibrational investigation of the lowest energy vibrational states of HC$_3$N.

We propose a new figure of merit, the molecular gain factor, that allows to discriminate transitions accessible by QCL-pumped THz gas lasers according to their lasing potential.

We report a joint pure rotational and ro-vibrational investigation of the lowest energy vibrational states of benzonitrile.

We report the rotational investigation and interstellar searches towards TMC-1 of ortho- and meta-dicyanobenzene.

We report an investigation of the catechol molecule from the millimeter-wave to the far-infrared domain.

The high resolution vibrational spectrum of vinyl acetylene (C2H3CCH) has been investigated in the far infrared region allowing the two energetically lowest vibrational fundamentals ν13 and ν18, and their respective hot bands, to be assigned.

We report the rotational and vibrational investigation of two polar derivatives of adamantane (C10H16), 1-cyanoadamantane (C10H15--CN) and 1-isocyanoadamantane (C10H15--NC), providing all necessary information for an active search of these species in space.