Study of forbidden transitions in atomic systems

Bibliographic Details
Main Author: Amaro, Pedro Manuel Duarte Gonçalves
Publication Date: 2011
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/10362/6916
Summary: A Thesis submitted for the co-tutelle degree of Doctor in Physics at Universidade Nova de Lisboa and Université Pierre et Marie Curie
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spelling Study of forbidden transitions in atomic systemsForbidden transitionsHCIQEDMulti-photon processesECRISXray spectroscopyA Thesis submitted for the co-tutelle degree of Doctor in Physics at Universidade Nova de Lisboa and Université Pierre et Marie CurieOne active topic in Atomic Physics is the study of highly charged ions (HCI). These physical systems have a strong Coulomb field that provides a unique opportunity to investigate and validate relativistic, Quantum ElectroDynamics (QED), and many-body e ects. Moreover, fundamental test on symmetries and parity violation gives clues to the physics beyond the Standard Model. Thus, nowadays, a primary goal of Atomic Physics is the existence of precise experimental data and accurate theoretical calculations for these systems. In this thesis I focus on the investigation of forbidden radiative transitions in HCI. The main emphasis of this work is on atomic transitions, in which the selection rules forbids the emission of electric dipole photons. In this special type of radiative transition, the electron decays mainly through the emission of a single magnetic dipole photon, or two electric dipole photons. Both types of decay are investigated either experimentally or theoretically. The two-photon decay is only theoretically investigated, using a full relativistic formalism,in HCI with one or two electrons. Several physical e ects in the two photon decay, such as resonances, the Dirac’s negative continuum or angular correlations are considered. Related with the decay, two-photon excitation is also investigated. According to these evaluations, I stress the importance of relativistic and nondipolar e ects. Moreover, a new approach based on the B-polynomials basis set is employed on two-photon transitions. The second part of the work is devoted to the precise measurement of transitions in highly charged Ar with two to four electrons. For that matter, I describe the technical features of a double crystal spectrometer used to perform those measurements in HCI for the first time. This kind of spectrometer is able to perform absolute and precise measurements with an accuracy never achieved in these systems, which enables a comparison with recent QED calculations. I describe a Monte-Carlo code developed with the purpose of studying several systematic errors, as well as testing the various methods of retrieving physical quantities from raw data. Finally, I present the first absolute 2 ppm measurements on HCI with this spectrometer, paying special attention on the forbidden magnetic dipole transition in He-like Ar.Accõess Integradas Luso-Alem˜as (Contract no A-19/09); Fundação de Ciências e Tecnologia (FCT)- contract SFRH/BD/37404/2007 ; Programa Operacional Potencial Humano (POPH/FSE) and European Union social fundFaculdade de Ciências e TecnologiaJosé, SantosIndelicato, PaulRUNAmaro, Pedro Manuel Duarte Gonçalves2012-01-30T11:43:06Z20112011-01-01T00:00:00Zdoctoral thesisinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10362/6916TID:101331690enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2024-05-22T17:10:11Zoai:run.unl.pt:10362/6916Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-28T16:40:57.855573Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Study of forbidden transitions in atomic systems
title Study of forbidden transitions in atomic systems
spellingShingle Study of forbidden transitions in atomic systems
Amaro, Pedro Manuel Duarte Gonçalves
Forbidden transitions
HCI
QED
Multi-photon processes
ECRIS
Xray spectroscopy
title_short Study of forbidden transitions in atomic systems
title_full Study of forbidden transitions in atomic systems
title_fullStr Study of forbidden transitions in atomic systems
title_full_unstemmed Study of forbidden transitions in atomic systems
title_sort Study of forbidden transitions in atomic systems
author Amaro, Pedro Manuel Duarte Gonçalves
author_facet Amaro, Pedro Manuel Duarte Gonçalves
author_role author
dc.contributor.none.fl_str_mv José, Santos
Indelicato, Paul
RUN
dc.contributor.author.fl_str_mv Amaro, Pedro Manuel Duarte Gonçalves
dc.subject.por.fl_str_mv Forbidden transitions
HCI
QED
Multi-photon processes
ECRIS
Xray spectroscopy
topic Forbidden transitions
HCI
QED
Multi-photon processes
ECRIS
Xray spectroscopy
description A Thesis submitted for the co-tutelle degree of Doctor in Physics at Universidade Nova de Lisboa and Université Pierre et Marie Curie
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-01-01T00:00:00Z
2012-01-30T11:43:06Z
dc.type.driver.fl_str_mv doctoral thesis
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/6916
TID:101331690
url http://hdl.handle.net/10362/6916
identifier_str_mv TID:101331690
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
_version_ 1833596110482964480

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