Speaker
Description
Over the past forty years, the CRESU (Cinétique de Réaction en Écoulement Supersonique Uniforme) technique has been a workhorse for investigating ion-molecule and neutral-neutral reactions in the low temperature regime [1], with temperatures reaching as low as 5.8 K [2]. The uniform supersonic flow, produced by a Laval nozzle, is known to be a wall-less, high-density flow of gas thermalised across all degrees of freedom [1, 3]. Recently, our group has combined a low temperature uniform supersonic flow with direct frequency comb spectroscopy (DFCS) for the first time [4], allowing the rotational and vibrational degrees of freedom of gases in the flow to be probed simultaneously. I will be presenting an overview of our new instrument, along with some of our first spectroscopic results.
[1] Rowe, B. R.; Canosa, A.; Heard, D. E. WORLD SCIENTIFIC (EUROPE) June 2022.
[2] Berteloite, C.; Lara, M.; Bergeat, A.; Le Picard, S. D.; Dayou, F.; Hickson, K. M.; Canosa, A.; Naulin, C.; Launay, J.-M.; Sims, I. R.; Costes, M. Phys. Rev. Lett. 2010, 105 (20).
[3] Sims, I. R.; Smith, I. W. M. Annu. Rev. Phys. Chem. 1995, 46 (1), 109–138.
[4] Lucas, D. I.; Guillaume, T.; Heard, D. E.; Lehman, J. H. J. Chem. Phys. 2024, 161 (9).
