Vector Correlations in Dissociative Photoionization of Diatomic Molecules in the VUV Range: Strong Anisotropies in Electron Emission from Spatially Oriented NO Molecules

Lafosse, A.; Lebech, M.; Brenot, J. C.; Guyon, P. M.; Jagutzki, O.; Spielberger, L.; Vervloët, M.; Houver, J. C.; Dowek, D.

doi:10.1103/physrevlett.84.5987

Cited by 130 publications

(94 citation statements)

References 36 publications

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“…Our coincidence momentum imaging apparatus is based on a measurement of electron and ion time of flight (TOF) with two multi-hit two-dimensional position sensitive detectors [23][24][25]. Similar apparatus are used by other groups as well [9,26,27]. A supersonic jet of CO 2 in the vertical direction crosses the photon beam in the horizontal direction.…”

mentioning

confidence: 99%

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Saitô

Ueda

Fanis

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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We have measured photoelectron angular distributions in the molecular frame (MF-PADs) for O 1s photoemission from CO 2 , using photoelectron-O + -CO + coincidence momentum imaging. Results for the molecular axis at 0, 45 and 90• to the electric vector of the light are reported. The major features of the MF-PADs are fairly well reproduced by calculations employing a relaxed-core Hartree-Fock approach. Weak asymmetric features are seen through a plane perpendicular to the molecular axis and attributed to symmetry lowering by anti-symmetric stretching motion.(Some figures in this article are in colour only in the electronic version) Photoelectron angular distributions in the molecular frame (MF-PADs) have been investigated extensively for K-shell photoemission from the diatomic molecules CO and N 2 [1-9]. The MF-PADs for molecules aligned parallel to the electric vector of the linearly polarized light exhibit rich structure in regions of shape resonances and provide a dynamical window on the underlying partial-wave composition of the photoelectron as it scatters off the anisotropic potential of the ion. It is worth noting that the observed MF-PADs for N 2 display reflection

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mentioning

confidence: 99%

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Saitô

Ueda

Fanis

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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“…Des calculs basés sur l'équation de Schrödinger dépendant du temps (TDSE) prédisent une évolution significative des observables caractérisant la DPI en fonction de la largeur spectrale de l'impulsion de quelques fs qui induit la réaction [7][8][9]. Les expériences de corrélations vectorielles (CV), mesurant en coïncidence les vecteurs vitesses d'émission de l'ion et de l'électron [10,11], fournissent les informations les plus complètes sur la dynamique moléculaire. Leur couplage avec l'utilisation de sources d'harmoniques d'ordre élevé (HHG) ouvre la voie à des études résolues en temps à l'échelle fs [12].…”

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Corrélations vectorielles dans la photoionisation dissociative de H₂par une harmonique XUV femtoseconde sélectionnée spectralement par des miroirs multicouches

Billaud

Géléoc

Delmotte

et al. 2013

UVX 2012 - 11e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X ; Applications Et Développements Récents

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Résumé. Nous avons démontré la faisabilité de mesures de corrélations vectorielles dans la photoionisation dissociative de H 2 auprès d'une source XUV femtoseconde d'harmonique d'ordre élevé cadencée à 1 kHz [1]. Dans ce contexte, nous présentons les miroirs multicouches conçus, réalisés et caractérisés par la Centrale d'Elaboration et de Métrologie d'Optiques X pour sélectionner cette harmonique 21 à ∼32 eV (∼40 nm). Nous avons mesuré une série d'observables, de la distribution en coïncidence des énergies cinétiques de l'ion fragment et de l'électron aux distributions angulaires du photoélectron émis dans le référentiel moléculaire (MFPADs), ainsi que leur évolution avec l'énergie cinétique de l'ion fragment. Ces résultats ouvrent la voie à des études résolues en temps, basées sur la mesure des MFPADs, de la dynamique femtoseconde des états doublements excités Q 1 et Q 2 de H 2 .

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“…The use of short intense laser pulses [9] to spatially align molecules, which can be ionized after a controlled delay in field free conditions with a XUV femtosecond pulse [10], has opened recently a possibility to measure molecular frame photoemission, particularly valuable for the study of non-dissociative PI reactions under the condition of a high degree of initial alignment. The alternative approach, presented in this paper, is to take advantage of dissociative photoionization (DPI) reactions to measure the molecular frame photoelectron angular distributions (MFPADs) from an assembly of isotropically oriented molecules, using the vector correlation (VC) method [11,12] or another momentum spectroscopy like the COLTRIMS method [13]. Indeed, for linear molecules breaking into two fragments in the axial recoil approximation [14], i.e.…”

Section: Uvx 2008mentioning

confidence: 99%

Electron-ion vector correlations for the study of photoionization of molecules in the UVX range: From synchrotron radiation to short light pulses

Elkharrat

Picard

Billaud

et al. 2009

UVX 2008 - 9e Colloque Sur Les Sources Cohérentes Et Incohérentes UV, VUV Et X : Applications Et Développements Récents

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Abstract. Molecular frame photoemission is a very sensitive probe of the photoionization (PI) dynamics of molecules. The electron-ion vector correlation (VC) method takes advantage of dissociative photoionization (DPI) reactions of small molecules to measure such observables. It relies on the coincident detection of the photoelectron and the ion fragment emitted from the same DPI event and the determination of their velocity vectors. Most of the VC studies so far have been performed using synchrotron radiation (SR) light sources which benefit from a high repetition rate (1-10 MHz) favorable for coincidence experiments. In this paper we discuss the extension of this method to the study of PI processes induced by ultra-short VUV light sources, which provide the capability for investigating processes characterized by femtosecond or subfemtosecond dynamics. We first illustrate the VC method by the report of recent results of a comparative study of resonant photoionization of the H 2 and D 2 molecules induced by VUV circularly polarized synchrotron radiation at SOLEIL in the region involving resonant excitation of Q 1 and Q 2 doubly excited state series. This problem is of particular interest since autoionization and dissociation of selected Q 1 or Q 2 states occur on a comparable time scale of few femtoseconds, which implies a coupling between the electronic and nuclear motion. The extension of the VC method using femtosecond laser sources is then demonstrated by results for multiphoton PI of the Xe atom induced by 70 fs pulses centered at 400 nm delivered by the SOFOCKLE and PLFA sources (SLIC, CEA-Saclay) after frequency doubling of a 1 kHz Ti:sapphire laser.

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Vector Correlations in Dissociative Photoionization of Diatomic Molecules in the VUV Range: Strong Anisotropies in Electron Emission from Spatially Oriented NO Molecules

Cited by 130 publications

References 36 publications

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Corrélations vectorielles dans la photoionisation dissociative de H₂par une harmonique XUV femtoseconde sélectionnée spectralement par des miroirs multicouches

Electron-ion vector correlations for the study of photoionization of molecules in the UVX range: From synchrotron radiation to short light pulses

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Vector Correlations in Dissociative Photoionization of Diatomic Molecules in the VUV Range: Strong Anisotropies in Electron Emission from Spatially Oriented NO Molecules

Cited by 130 publications

References 36 publications

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO2molecules

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO2molecules

Corrélations vectorielles dans la photoionisation dissociative de H2par une harmonique XUV femtoseconde sélectionnée spectralement par des miroirs multicouches

Electron-ion vector correlations for the study of photoionization of molecules in the UVX range: From synchrotron radiation to short light pulses

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Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Molecular frame photoelectron angular distribution for oxygen 1s photoemission from CO₂molecules

Corrélations vectorielles dans la photoionisation dissociative de H₂par une harmonique XUV femtoseconde sélectionnée spectralement par des miroirs multicouches