The Heroes Of Terahertz Synchrotron Spectroscopy

Hearne, Thomas Sandow

Permalink

https://hdl.handle.net/2142/111150 Copy

Description

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

Issue Date

2021-06-22

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111150

DOI

10.15278/isms.2021.TI01

Owning Collections