CERN Accelerating science

Article
Report number	arXiv:2104.05567
Title	Mechanism of Indirect Photon-induced Desorption at the Water Ice Surface
Author(s)	Dupuy, R. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Bertin, M. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Féraud, G. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Michaut, X. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Marie-Jeanne, P. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Jeseck, P. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Philippe, L. (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry) ; Baglin, V. (CERN) ; Cimino, R. (LNF, Dafne Light) ; Romanzin, C. (U. Paris-Sud 11, Dept. Phys., Orsay ; U. Paris-Saclay) ; Fillion, J.-H (Paris U., IV ; Paris Observ. ; U. PSL ; LERMA, Ivry)
Publication	2021
Imprint	2021-04-12
Note	Supplemental Material available freely at https://journals.aps.org/prl/supplemental/10.1103/PhysRevLett.126.156001
In:	Phys. Rev. Lett. 126 (2021) 156001
DOI	10.1103/PhysRevLett.126.156001 (publication)
Subject category	physics.chem-ph ; Chemical Physics and Chemistry
Abstract	Electronic excitations near the surface of water ice lead to the desorption of adsorbed molecules, through a so far debated mechanism. A systematic study of photon-induced indirect desorption, revealed by the spectral dependence of the desorption (7 to 13 eV), is conducted for Ar, Kr, N$_{2}$, and CO adsorbed on H$_{2}$O or D$_{2}$O amorphous ices. The mass and isotopic dependence and the increase of intrinsic desorption efficiency with photon energy all point to a mechanism of desorption induced by collisions between adsorbates and energetic H or D atoms, produced by photodissociation of water. This constitutes a direct and unambiguous experimental demonstration of the mechanism of indirect desorption of weakly adsorbed species on water ice, and sheds new light on the possibility of this mechanism in other systems. It also has implications for the description of photon-induced desorption in astrochemical models.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0)

Corresponding record in: Inspire