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Daunant, I. Colomb de; Vassilev, G.; Dumont, Michel; Baudon, J.

doi:10.1103/physrevlett.46.1322

Cited by 14 publications

(4 citation statements)

References 20 publications

(7 reference statements)

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“…3.2 INELASTIC SCATTERING. 2013 In fact, several experimental data indicate that this good agreement between experiment and calculations based on purely elastic scattering is no longer preserved when the collision energy becomes larger than about 90 meV : (i) the elastic cross sections measured by Beyer et al [10] at 111 meV and 143 meV exhibit some anomalies in their u-g interference pattern; (ii) by detecting metastable atoms scattered in the direction perpendicular to the incident beam planewhich eliminates any elastic or endothermic collision process - [12], we have observed the superelastic fine structure transition :…”

Section: Purely Elastic Collision -The Argumentmentioning

confidence: 98%

An adjustment of the Ne*2(3P0,2-1S 0) potentials to thermal-energy scattering data

et al. 1982

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2014 On présente ici une recherche semi-empirique des potentiels du dimère Ne*2, pour les états se dissociant en Ne(3P0,2) + Ne(1S0). Partant des potentiels ab initio calculés par Cohen et Schneider, on a déterminé une modification 2014 aussi faible que possible et restreinte au seul domaine des distances intermédiaires (4-10 u.a.) 2014 conduisant à un accord amélioré de la théorie et des expériences effectuées aux énergies thermiques. La modification proposée n'affecte que l'état 303A3u+. Il en résulte, après diagonalisation de l'interaction spin-orbite, des diminutions homógènes des potentiels 0-u , 1u(3P2) et 0-u(3P0). La bosse présente sur les deux premiers se trouve ainsi abaissée (de 108 à 21 meV), ce qui donne un accord satisfaisant avec les expériences effectuées sur la collision Ne(3P2)-Ne(1S0), particulièrement pour ce qui est de l'effet arc-en-ciel. L'élargissement imposé au puits 1u se trouve confirmé par le spectre d'émission de l'excimère. Aux énergies inférieures à 80 meV, la collision Ne(3P0)-Ne(1S0) est considérée comme purement élastique. Aux énergies supérieures, l'intervention de couplages dynamiques provoque une perturbation de la section efficace élastique, et l'apparition du processus superélastique: 3P0~1,2. On interprète ces deux effets en utilisant un modèle à deux états. Abstract. 2014 A semi-quantal interpretation of the Ne*2 potentials, for states dissociating into Ne(2p5 3s, 3P0,2) + Ne(2p6, 1S0) is presented. Starting from the ab initio potentials calculated by Cohen and Schneider, one determines a modification 2014 as small as possible and confined to the intermediate distance range (4-10 a.u.) 2014 yielding a better agreement between theory and experiment in the thermal energy range. The proposed modification affects only the 303A3+u state. After the diagonalization of the spin-orbit interaction, it results in consistent diminutions of the 0-u-1u(3P2) and 0-u(3P0) potentials. The hump of the two former states is lowered (21 meV instead of 108 meV) which gives good agreement with experiments on the Ne(3P2)-Ne(1S0) collision, especially for the resulting rainbow effect. The widening imposed on the 1u-well is confirmed by the excimer emission spectra. At energies below 80 meV, the Ne(3P0) + Ne(1S0) collision is considered as purely elastic. Above this energy, dynamical couplings induce a perturbation of the elastic differential cross section and the 3P0~1,2 superelastic process. These latter effects are interpreted by using a simplified 2-state model.

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Section: Purely Elastic Collision -The Argumentmentioning

confidence: 98%

An adjustment of the Ne*2(3P0,2-1S 0) potentials to thermal-energy scattering data

et al. 1982

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“…Electrostatic deflecting plates eliminate charged particles from the atomic beam. Previous experiments [5] have shown that 3P2 and 3po metastable levels are populated proportionally to their statistical weights (5 : 1).…”

Section: Introductionmentioning

confidence: 94%

Differential measurements on elastic and rotationally inelastic Ne*( 3P0,2)-H2 collisions at thermal energies

et al. 1985

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2014 On décrit une expérience de faisceaux croisés dans laquelle la sélection en vitesse est obtenue au moyen d'une technique de double hachage. La résolution est suffisante pour séparer les collisions Ne*(2p53s, 3P0,2)-H2 accompagnées d'excitation rotationnelle, de celles qui sont purement élastiques. On donne les sections efficaces différentielles mesurées à 67 meV, dans le référentiel du centre de masse, pour les collisions élastiques (J = 0 ~ J = 0) et rotationnellement inélastiques (J = 0 ~ J = 2). Abstract. 2014 A velocity selected crossed beam experiment, using a double chopping technique, is described. Its resolution is good enough to discriminate rotationally inelastic Ne*(2p53s, 3P0,2) on H2 collisions from purely elastic ones. Elastic (0 ~ 0) and inelastic (0 ~ 2) differential cross sections in the C.M. frame are given, for a relative energy of 67 meV.

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“…The angular dependence of the scattered intensity and the velocity dependence of the differential cross-section in the backward scattering direction are given. Differential cross-sections in metastable Ne on Ne collisions at thermal energies have recently been measured in supersonic [ 1,2] or effusive [3,4] crossed beam experiments. These measurements are a stringent test of the validity of the calculated Ne!…”

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confidence: 99%

“…As it has already been shown in the case of the Ne! system [4,5], a more complete knowledge of the involved molecular states, as well as their mutual couplings, needs a detailed study of eventual inelastic processes (essentially the fine-structure transitions). This work is now in progress.…”

mentioning

confidence: 99%

Differential measurements of metastable Ar(3p5 4s, 3P 0,2) on Ar(3p6, 1S0) collisions at thermal energies

et al. 1982

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Fine-Structure Transition in Ne(P03) on Ne(

Cited by 14 publications

References 20 publications

An adjustment of the Ne*2(3P0,2-1S 0) potentials to thermal-energy scattering data

An adjustment of the Ne*2(3P0,2-1S 0) potentials to thermal-energy scattering data

Differential measurements on elastic and rotationally inelastic Ne*( 3P0,2)-H2 collisions at thermal energies

Differential measurements of metastable Ar(3p5 4s, 3P 0,2) on Ar(3p6, 1S0) collisions at thermal energies

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