High Resolution Molecular Spectroscopy in the THz Region Using Synchrotron Radiation

Archive ouverte : Communication dans un congrès

Hearne, T. | Mammez, Marie-Hélène | Mammez, Dominique | Martin-Durel, M.-A. | Eliet, S. | Barbieri, Stefano | Hindle, Francis | Roy, P. | Lampin, Jean-Francois | Mouret, Gaël | Pirali, Olivier

Edité par HAL CCSD ; IEEE

International audience. Our team exploits the synchrotron radiation extracted by the AILES beamline of SOLEIL synchrotron facility to study different molecular physics problematics in the far-IR and THz spectral ranges. The existing experimental configuration of the beamline, with a high-resolution Bruker interferometer, allows the rotationally resolved spectra of a large number of molecules to be obtained. These absorption spectra cover a broad spectral range (typically between 1 and 30 THz, i.e., 30 and 900 cm -1 ) but are limited in terms of spectral resolution to 30 MHz (0.001 cm -1 ) by the ultimate optical path difference provided by the interferometer. To push the resolution limit further, we are developing a new spectrometer allowing to record sub-MHz resolution absorption spectra using heterodyne mixing of the synchrotron radiation with a THz molecular laser.

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