Recent advances in collisional effects on spectra of molecular gases and their practical consequences

Jean-Michel Hartmann (1, 2) , Ha Tran (1, 2) , Raymond Armante (1, 2) , Christian Boulet (3) , Alain Campargue (4) , Francois Forget (1, 2) , Livio Gianfrani (5) , Iouli Gordon , Sandrine Guerlet (1, 2) , Magnus Gustafsson (6) , Joseph T. Hodges , Samir Kassi (4) , Daniel Lisak (7) , Franck Thibault (8) , Geoffrey C. Toon (9)

1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
2 IPSL (FR_636) - Institut Pierre-Simon-Laplace
3 ISMO - Institut des Sciences Moléculaires d'Orsay
4 LIPhy - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères]
5 Università degli studi della Campania "Luigi Vanvitelli" = University of the Study of Campania Luigi Vanvitelli
6 LUT - Luleå University of Technology
7 Nicolaus Copernicus University [Toruń]
8 IPR - Institut de Physique de Rennes
9 CALTECH - California Institute of Technology

We review progress, since publication of the book "Collisional effects on molecular spectra Laboratory experiments and models, consequences for applications" (Elsevier, Amsterdam, 2008), on measuring, modeling and predicting the influence of pressure (ie of intermolecular collisions) on the spectra of gas molecules. We first introduce recently developed experimental techniques of high accuracy and sensitivity. We then complement the aforementioned book by presenting the theoretical approaches, results and data proposed (mostly) in the last decade on the topics of isolated line shapes, line-broadening and-shifting, line-mixing, the far wings and associated continua, and collision-induced absorption. Examples of recently demonstrated consequences of the progress in the description of spectral shapes for some practical applications (metrology, probing of gas media, climate predictions) are then given. Remaining issues and directions for future research are finally discussed.

Keywords: Pressure effects on spectral shapes; Theories and models; Molecular physics; CRESU; Available data; Experimental techniques; Atomic and molecular collisions; Quantum dynamics; Consequences for applications

Domains: Physics [physics]

Jean-Michel Hartmann, Ha Tran, Raymond Armante, Christian Boulet, Alain Campargue, et al.. Recent advances in collisional effects on spectra of molecular gases and their practical consequences. Journal of Quantitative Spectroscopy and Radiative Transfer, 2018, 213, pp.178-227. ⟨10.1016/j.jqsrt.2018.03.016⟩. ⟨hal-01833211v2⟩