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Title:The Heroes Of Terahertz Synchrotron Spectroscopy
Author(s):Hearne, Thomas Sandow
Contributor(s):Mouret, Gaël; Hindle, Francis; Mammez, Dominique; Mammez, Marie-Hélène; Lampin, Jean-François; Roy, P.; Martin-Drumel, Marie-Aline; Pirali, Olivier
Subject(s):Instrument/Technique Demonstration
Abstract:Technological innovation is a key driver in the field of molecular spectroscopy, and despite recent leaps forward with chirped-pulse spectroscopy, multiplication chains, dual-comb techniques, and mid-infrared lasers, there remains still a sizeable spectral gap, untouched by these innovations, from around 1 to 10 THz. In this terahertz gap it is still difficult to produce high-resolution broadband spectra. The HEROES project aims to fill the gap, by combining a new generation of far-IR molecular laser with synchrotron radiation.\footnote{Lampin, J.-F. et al. Opt. Lett. (2019) 44, 20}\footnote{Paiges, A. et al. APL Photonics (2016) 1, 031302} The HEROES spectrometer uses heterodyne mixing of a far-IR laser, pumped by a quantum cascade laser, with broadband far-IR synchrotron radiation, within a hot electron bolometer to produce spectra from 1 to 5.5 THz with 5 GHz instantaneous bandwidth and 80 kHz resolution. This resolution is 375 times finer than the ultimate resolution available with the Bruker Fourier-transform infrared (FTIR) spectrometer installed on the AILES beamline at SOLEIL (30 MHz). This allows for far more precise determinations of transition energies, particularly important in the field of astrochemistry. Recent improvements to the HEROES spectrometer will be presented, along with a demonstration of its ability to resolve complicated spectral features, such as transitions in the rotational-torsional spectrum of methanol and its deuterated isotopologues. Further improvements to the technique will also be proposed.
Issue Date:2021-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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