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Theme 1: Spectroscopy of neutral, radical and ionic molecules for astrophysics
Rotational spectroscopy from the sub-mm to the THz range
The advent of new generation observational platforms as the Atacama Large Millimeter Array (ALMA) and the NOrthern Extended Millimeter Array (NOEMA), that allows observation of various astrophysical objects in the millimeter and submillimeter wavelengths (roughly 50 GHz -1 THz), strengthen the need for laboratory data in this spectral range for molecules of astrophysical interest. To enable new interstellar detections, our groups investigate in the laboratory the rotational spectrum of (…)
Rovibrational spectroscopy from the far-IR to the mid-IR
Our team exploits the far infrared synchrotron radiation extracted by the AILES beamline of [SOLEIL synchrotron->http://www.synchrotron-soleil.fr to record and to analyze high resolution absorption spectra of gas-phase species. The spectra are recorded at the ultimate resolution of 30 MHz with a Bruker IFS125 Fourier Transform interferometer, allowing the study of rotational structures of various molecular species. Several experimental set-ups have been developed in association with the (…)
Spectroscopy in high finesse cavities
The aim of several members of the group is to obtain new spectroscopic information concerning neutral saturated molecules and neutral or ionic molecular radicals of astrophysical interest produced either within plasma generated by a radiofrequency (13.56 MHz ), microwave or electric discharge, or thanks to laser photolysis. Various spectroscopic data can be obtained such as: position of absorption bands, absorption cross sections, oscillator strengths, rotational constants, radical (…)
Medium to high resolution VUV spectroscopy
The scientific skills of the group include the study of the rotationally-resolved vibronic excited structure of small molecules and radicals (neutral or cation) investigated with various photon excitation sources at ISMO or on vacuum-ultraviolet plateforms such as SOLEIL synchrotron (DESIRS beamline) and the laser facility of CLUPS laser center. This research activity benefits from a broadly tunable nanosecond-pulsed VUV laser at ISMO which enables new spectroscopic investigations in the (…)
Electronic spectroscopy of PAHs and their derivatives
Polycyclic aromatic hydrocarbons (PAHs) and their ionic derivatives are at the focus of several research projects because of their astrophysical interest. Large molecules which supposedly resemble PAHs are expected to be present in space and give rise (or participate) to spectroscopic features observed from the infrared to the UV range of wavelength, namely the aromatic infrared bands (AIBs), the diffuse interstellar bands and the UV bump at 217 nm. At ISMO, we study the high to medium (…)