Skip to main content
Aller à la page d’accueil de la Commission européenne (s’ouvre dans une nouvelle fenêtre)
français fr
CORDIS - Résultats de la recherche de l’UE
CORDIS
Contenu archivé le 2024-04-16

IONISATION ET SPECTROSCOPIES DE COINCIDENCE

Objectif


Direct ionisation studies including the measurement of accurate absolute cross sections for the triple differential (e,2e) ionisation cross section (TDCS) near to threshold, at intermediate energies and at very high energies have permitted quantitative comparisons with theories, some of which differ by large factors but have very similar form. The extension of measurements to noncoplanar scattering geometries has allowed detailed tests to theory, including separation of the contributions from singlet and triplet scattering. The important role of double scattering in the electron impact ionisation reaction, in which the incident electron scatters first from the nucleus and then from a target electron, which had been theoretically predicted, was experimentally investigated over a wide range of kinematics and energies and very accurately calculated. At relativistic energies, spin flip processes have been discovered to be important, in contrast to expectations. Cooperation between experimentalists and theoreticians is finally making clear the mechanisms for ionisation near to threshold, where various high energy approximations are inappropriate and the full 3-body coulomb problem must be considered.

Measurement of cross sections for ionisation in which the ion is left in an excited state have tested the theoretical understanding of correlated 2-electron processes. Also the effects of shape resonances on (e,2e) cross sections in molecules have been detected and measured for the first time.

The investigation of photon or electron impact double ionisation phenomena has also taken great steps forward, experimentally and theoretically and absolute 5-fold differential cross sections for double ionisation (ie involving triple coincidence experiments) have been measured for the first time.

The effect of a strong laser field on the target (dressed states) and the ionisation reaction has been calculated in detail and is predicted to result in important measurable effects , opening up a new subfield for study.

Furthermore, a great deal of effort has been devoted to the development of multicoincidence, multiparameter data collection systems in order to increase the signal rates by an order of magnitude or more and hence permit inner shell and triple coincidence experiments which are presently infeasible, thus opening up new fields of investigation. The application of the (e,2e) method to the measurement of electronic states in solids is also being studied.
Extension of the former activities realized by french groups (RCP n. 784 -C.N.R.S.) during 1984-87. Realize and develop a structured collaboration with various exchanges and cooperations between several european groups involved in (e, 2e) coincidence techniques and their applications to physical and chemical studies (electronic subshell studies of atoms or molecules in gas phase, clusters, thin films, surfaces...). Contributions to plasma problems and ionisation mechanisms (single, multiple or laser-assisted) as complementary to photoionisation techniques.

Champ scientifique (EuroSciVoc)

CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN. Voir: Le vocabulaire scientifique européen.

Vous devez vous identifier ou vous inscrire pour utiliser cette fonction

Programme(s)

Programmes de financement pluriannuels qui définissent les priorités de l’UE en matière de recherche et d’innovation.

Thème(s)

Les appels à propositions sont divisés en thèmes. Un thème définit un sujet ou un domaine spécifique dans le cadre duquel les candidats peuvent soumettre des propositions. La description d’un thème comprend sa portée spécifique et l’impact attendu du projet financé.

Données non disponibles

Appel à propositions

Procédure par laquelle les candidats sont invités à soumettre des propositions de projet en vue de bénéficier d’un financement de l’UE.

Données non disponibles

Régime de financement

Régime de financement (ou «type d’action») à l’intérieur d’un programme présentant des caractéristiques communes. Le régime de financement précise le champ d’application de ce qui est financé, le taux de remboursement, les critères d’évaluation spécifiques pour bénéficier du financement et les formes simplifiées de couverture des coûts, telles que les montants forfaitaires.

CSC - Cost-sharing contracts

Coordinateur

TECHNISCHE UNIVERSITÄT KAISERSLAUTERN
Contribution de l’UE
Aucune donnée
Adresse
ERWIN-SCHRÖDINGER-STRAßE
KAISERSLAUTERN
Allemagne

Voir sur la carte

Coût total

Les coûts totaux encourus par l’organisation concernée pour participer au projet, y compris les coûts directs et indirects. Ce montant est un sous-ensemble du budget global du projet.

Aucune donnée

Participants (4)

Mon livret 0 0