Work

Experimental observation of quantum interferences in CO − H 2 rotational energy transfer at room temperature

Year: 2025

Type: article

Abstract: Using time-resolved infrared--vacuum-ultraviolet double-resonance spectroscopy, experimental room-temperature measurements of state-to-state rate coefficients for rotational energy transfer within the $X{\phantom{\rule{0.16em}{0ex}}}^{1}{\mathrm{\ensuremath{\Sigma}}}^{+}(v=2)$ vibrational state of CO due to ${\mathrm{H}}_{2}$ collisions have been compared to accurate four-dimensional close-coupling quantum calculations. Theoretically predicted quantum interferences in the ${\text{CO-H}}_{2}$ collisional system are experimentally observed at room temperature, and excellent agreement between theory and experiment is observed. These results provide a valuable benchmark for validating the anisotropic part of the potential energy surface, thereby supporting the theoretical modeling of CO emission in warm astrophysical environments such as photodissociation regions.

Source: Physical Review A

DOI: 10.1103/vmq7-89ln

Authors: Hamza Labiad, Alexandre Faure, Ian R. Sims

Institutions: Université de Rennes, Pôle de recherche et d'enseignement supérieur Université de Grenoble, Université Grenoble Alpes, Institut Universitaire de France

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: green

Funders: Agence Nationale de la Recherche, Centre National d’Etudes Spatiales, Centre National de la Recherche Scientifique

Awards: G6702880738, Excitation and chemistry of interstellar hydrides