title: Atomic Auger Doppler effects upon emission of fast photoelectrons.
abstract: Studies of photoemission processes induced by hard X-rays including production of energetic electrons have become feasible due to recent substantial improvement of instrumentation. Novel dynamical phenomena have become possible to investigate in this new regime. Here we show a significant change in Auger emission following 1s photoionization of neon, which we attribute to the recoil of the Ne ion induced by the emission of a fast photoelectron. Because of the preferential motion of the ionized Ne atoms along two opposite directions, an Auger Doppler shift is revealed, which manifests itself as a gradual broadening and doubling of the Auger spectral features. This Auger Doppler effect should be a general phenomenon in high-energy photoemission of both isolated atoms and molecules, which will have to be taken into account in studies of other recoil effects such as vibrational or rotational recoil in molecules, and may also have consequences in measurements in solids.
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [3] Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, FR-91192 Gif-sur-Yvette Cedex, France.
authors.forename: Marc
authors.initials: M
authors.lastname: Simon
authors.affiliation: Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany.
authors.forename: Ralph
authors.initials: R
authors.lastname: Püttner
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Marchenko
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Renaud
authors.initials: R
authors.lastname: Guillemin
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Rajesh K
authors.initials: RK
authors.lastname: Kushawaha
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Loïc
authors.initials: L
authors.lastname: Journel
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France.
authors.forename: Gildas
authors.initials: G
authors.lastname: Goldsztejn
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [3] Department of Physics and Astronomy, Uppsala University, PO Box 516, SE-75120 Uppsala, Sweden.
authors.forename: Maria Novella
authors.initials: MN
authors.lastname: Piancastelli
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, FR-91192 Gif-sur-Yvette Cedex, France.
authors.forename: James M
authors.initials: JM
authors.lastname: Ablett
authors.affiliation: 1] CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [2] Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, F-75005 Paris, France [3] Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, FR-91192 Gif-sur-Yvette Cedex, France.
authors.forename: Jean-Pascal
authors.initials: JP
authors.lastname: Rueff
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin-BP 48, FR-91192 Gif-sur-Yvette Cedex, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Céolin