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Author:
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ISBN:
Category : Weights and measures
Languages : en
Pages : 582
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Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 582
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Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 364
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Author: BRUNO.. ROUVELLOU
Publisher:
ISBN:
Category :
Languages : fr
Pages : 208
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Book Description
CETTE THESE PRESENTE LE RESULTAT DES PREMIERES MESURES DE DISTRIBUTION ANGULAIRE D'ELECTRONS EMIS DANS LA PHOTOIONISATION DIRECTE, EN COUCHE INTERNE, D'ATOMES PREALABLEMENT PORTES DANS UN ETAT EXCITE A L'AIDE D'UN LASER A COLORANT. LA PHOTOIONISATION EST PRODUITE PAR LE RAYONNEMENT SYNCHROTRON DE SUPER ACO DANS LE DOMAINE D'ENERGIE 40-140 EV. L'ELEMENT ETUDIE EST LE SODIUM PHOTOIONISE EN SOUS COUCHE 2P. UN DISPOSITIF SPECIAL A ETE CONSTRUIT POUR POUVOIR MESURER SIMULTANEMENT, DANS UN SPECTROMETRE A ELECTRONS DU TYPE MIROIR CYLINDRIQUE, LE SIGNAL DE PHOTOELECTRONS EMIS A SIX ANGLES DIFFERENTS. NOUS AVONS AINSI ETUDIE L'EFFET DE CHANGEMENT D'ORBITALE DE L'ELECTRON DE VALENCE SUR LES SPECTRES DE PHOTOIONISATION EN COUCHE INTERNE. LES RESULTATS ONT ETE INTERPRETES EN ETROITE COLLABORATION AVEC DES THEORICIENS QUI ONT DEVELOPPE UN CODE MATRICE-R A CET EFFET. ILS PERMETTENT DE MIEUX COMPRENDRE LES EFFETS DE CORRELATIONS ELECTRONIQUES. IL N'EXISTE QUE TRES PEU DE DONNEES EXPERIMENTALES SUR LA PHOTOIONISATION D'IONS ATOMIQUES MONOCHARGES. LES RECHERCHES PRESENTEES ICI SONT, POUR L'INSTANT, LES SEULES A UTILISER LA SPECTROSCOPIE D'ELECTRONS. DANS UNE PREMIERE SERIE D'EXPERIENCES, LA FAISABILITE DE CETTE ETUDE AVAIT ETE DEMONTREE PAR OBSERVATION DE SPECTRES D'ELECTRONS EMIS DANS LA PHOTOIONISATION RESONNANTE D'ION CA#+ POUR DES TRANSITIONS A FORTE SECTION EFFICACE ( 2000 MB). DIVERSES AMELIORATIONS ONT ETE APPORTEES LORS DU NECESSAIRE PASSAGE DE L'ENSEMBLE DU DISPOSITIF EXPERIMENTAL DANS UNE TECHNOLOGIE ULTRA-VIDE. UN NOUVEL ANALYSEUR D'ELECTRONS (CMA) A ETE CONCU POUR CETTE EXPERIENCE EN CHERCHANT LE MEILLEUR COMPROMIS TRANSMISSION-RESOLUTION A TRAVERS L'OPTIMISATION DES DIFFERENTS PARAMETRES INFLUANT SUR LA FORME ET L'INTENSITE DU SIGNAL D'ELECTRONS. L'OPTIQUE IONIQUE A ETE ETUDIEE EN DETAIL. LES RESULTATS ACQUIS LORS DE CETTE NOUVELLE PHASE DE L'EXPERIENCE PERMETTENT D'ENVISAGER L'ETUDE RESOLUE ANGULAIREMENT DE PROCESSUS RESONNANTS DONT LES SECTIONS EFFICACES SONT DE L'ORDRE DE 100 MB
Author: F. Wuilleumier
Publisher: Springer Science & Business Media
ISBN: 1468427997
Category : Science
Languages : en
Pages : 474
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Book Description
The Advanced Study Institute on "Photoionization and Other Probes of Many-Electron Interactions" was held at the Centre "Les Cigales" in Carry-Ie-Rouet (France), from August 31st till September 13th 1975. The Institute was sponsored by the Scienti fic Affairs Division of NATO. The "Centre National de la Recher che Scientifique" (France) gave also partial support to the French participants and the National Science Foundation (U. S . A. ) to the American participants. A total of 18 lecturers, and 54 students selected among more than 120 applicants, attended the Institute. Over the last few years, substantial progress has been made in the experimental study of photon- or electron interactions with atoms. In particular, the g. rowing number of facilities created to use the synchrotron radiation makes now possible the realization of new types of experiments. The accumulation of new results showed clearly it was necessary to introduce electron correlations in the theoretical models in order to explain the existence and the probability of a large number of processes, in particular multiple processes. Thus large progress has also been made in the theore tical description of the excitation of the electronic systems and their interactions. It was the purpose of this Institute to bring together theoreticians and experimentalists in order to provide an opportunity to present in details the state of the art, in experiment as well as in theory, and to favor discussions on future experimen tal and theoretical studies.
Author:
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ISBN:
Category : French periodicals
Languages : en
Pages : 530
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Author: SAMIR.. AL MOUSSALAMI
Publisher:
ISBN:
Category :
Languages : fr
Pages : 162
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Book Description
LE TRAVAIL PRESENTE ICI S'ATTACHE A ETUDIER LA DYNAMIQUE DES INTERACTIONS PHOTONS-ATOMES DANS LES ALCALINO-TERREUX, EN PARTICULIER A ETUDIER LA VARIATION DES EFFETS RELATIVISTES ET DES CORRELATIONS ELECTRONIQUES EN ALLANT DE CA A BA. A LA SUITE DES PRECEDENTES ETUDES SUR LE CALCIUM ET LE BARYUM ATOMIQUES, J'AI ETUDIE, PAR SPECTROMETRIE D'ELECTRONS INTEGREE ET RESOLUE ANGULAIREMENT AVEC L'AIDE DU RAYONNEMENT SYNCHROTRON, LES PROCESSUS DE PHOTOIONISATION EN SOUS-COUCHES DE VALENCE 5S ET INTERNES 4 P ET 4 S DANS LES ATOMES DE STRONTIUM DANS L'ETAT FONDAMENTAL POUR DES ENERGIES DE PHOTONS COMPRISES ENTRE 20 ET 190 EV. J'AI AUSSI ETUDIE L'EFFET SUR CES PROCESSUS DE L'EXCITATION, A L'AIDE D'UN RAYONNEMENT LASER, DE LA COUCHE EXTERNE FERMEE EN COUCHE OUVERTE A DEUX ELECTRONS. EN PARTICULIER, J'AI EXAMINE SI LE COUPLAGE ENTRE L'ELECTRON DE LA SOUS-COUCHE INTERNE 4P ET L'ELECTRON PROMU SUR L'ORBITALE EXTERNE 5P #3P#1 EST ASSEZ IMPORTANT POUR CHANGER DE FACON NOTABLE LA FORCE D'OSCILLATEUR D'EXCITATION DE LA RESONANCE GEANTE 4P 4D #1P#1, COMPARE A L'ETAT FONDAMENTAL 5S#2 #1S#0. MES RESULTATS ONT ETE CONFRONTES AUX PREVISIONS DE DIVERS MODELES THEORIQUES. ILS ONT MONTRE QUE DES EFFETS RELATIVISTES ET DES INTERACTIONS ELECTRONIQUES INTENSES RENDENT DIFFICILE LA DESCRIPTION DES ETATS DES ATOMES DE STRONTIUM, ET A FORTIORI DE L'ION SR#+ DANS L'ETAT FINAL, LORSQU'UNE LACUNE EST REALISEE DANS LA COUCHE INTERNE 4P. J'AI EGALEMENT ETUDIE, PAR SPECTROMETRIES ELECTRONIQUE ET IONIQUE, LA PHOTOIONISATION D'IONS MONOCHARGES. J'AI APPORTE DES AMELIORATIONS AU DISPOSITIF EXPERIMENTAL AFIN D'AUGMENTER SA SENSIBILITE, CE QUI PERMET DES A PRESENT D'ETUDIER LES PROCESSUS DE PHOTOIONISATION RESONNANTE DANS LES IONS MONOCHARGES, VOIR DOUBLEMENT CHARGES. J'AI MONTRE LA VALIDITE DU COUPLAGE LS DANS LA DESCRIPTION DE LA RESONANCE GEANTE 3P 3D #1P#1 DANS LES IONS CA#+ EN MESURANT A TRAVERS LE PROFIL DE LA RESONANCE LA DISTRIBUTION ANGULAIRE DES ELECTRONS D'AUTOIONISATION.
Author: J. W. Gallagher
Publisher:
ISBN:
Category : Atoms
Languages : en
Pages : 356
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Book Description
Author: Lee Joseph Kieffer
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 224
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Author: Robert D. Hudson
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 60
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Book Description
A bibliography of photoabsorption cross section data is presented. Only references which report a measured or calculated photoabsorption cross section (relative or normalized) in regions of continuous absorption are included. The bibliography is current as of January 1, 1970. (Author).
Author: Vladimir S. Lebedev
Publisher: Springer Science & Business Media
ISBN: 3642721753
Category : Science
Languages : en
Pages : 303
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Book Description
This monograph is devoted to the basic aspects of the physics of highly ex cited (Rydberg) states of atom's. After almost twenty years, this remains a hot topic of modern atomic physics. Such studies are important for many areas of physics and its applications including spectroscopy, astrophysics and radio astronomy, physics of electronic and atomic collisions, kinetics and di agnostics of gases, and low- and high-temperature plasmas. Physical phenom ena in radiative, collisional, and spectral-line broadening processes involving Rydberg atoms and ions are primarily determined by the peculiar properties and exotic features of highly excited states. The growth of interest and research activity in the physics of Rydberg the last two decades was stimulated by an extremely rapid de atoms over velopment of high-resolution laser spectroscopy, methods of selective excita tion and detection of highly excited states, atomic-beam techniques as well as radio astronomy. This has facilitated significant progress in the differ ent directions of the physics of highly excited atoms being of fundamental and practical importance. In particular, evident advances were achieved in studies of the structure and spectra of highly excited atoms, their behavior in static electric and magnetic fields, interactions with electromagnetic ra diation, spectral-line broadening and the shift of Rydberg series, collisions with electrons, ions, atoms, and molecules, etc. The principle objective of the present book is to reflect the most important physical approaches and efficient theoretical techniques in the modem physics of highly excited atoms and ions.
