# 2

## The bending of C$_3$: Experimentally probing the $l$-type doubling and resonance

We report a joint rovibronic and rovibrational study of C3.

## Pure rotational spectroscopy of the CH$_2$CN radical extended to the sub-millimeter wave spectral region

We present a thorough pure rotational investigation of the CH2CN radical in its ground vibrational state.

## Ring-opening dynamics of the cyclopropyl radical and cation: the transition state nature of the cyclopropyl cation

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

## Tunneling motion and splitting in the CH$_2$OH radical: (Sub-)millimeter wave spectrum analysis

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

## Unlocking synchrotron sources for THz spectroscopy at sub-MHz resolution

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

## Synchrotron-based far-infrared spectroscopy of HC$_3$N: Extended ro-vibrational analysis and new line list up to 3360 cm$^{−1}$

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

## Optically Pumped Terahertz Molecular Laser: Gain Factor and Validation up to 5.5 THz

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.

## The eight lowest-energy vibrational states of benzonitrile: analysis of Coriolis and Darling-Dennison couplings by millimeter-wave and far-infrared spectroscopy

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

## Hunting the relatives of benzonitrile: Rotational spectroscopy of dicyanobenzenes

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

## Intramolecular H-bond dynamics of catechol investigated by THz high-resolution spectroscopy of its low-frequency modes

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