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Theoretical Investigations in Photoionization: Ultra-Fast Pulses in Noble Gases, Core Excitations in Ytterbium and Relativistic Systems
Theoretical Investigations in Photoionization: Ultra-Fast Pulses in Noble Gases, Core Exci...
Theoretical Investigations in Photoionization: Ultra-Fast Pulses in Noble Gases, Core Excitations in Ytterbium and Relativistic Systems

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자료유형  
 학위논문 서양
최종처리일시  
20250211152750
ISBN  
9798342116824
DDC  
530
저자명  
Bustos, Miguel Angel Alarcon.
서명/저자  
Theoretical Investigations in Photoionization: Ultra-Fast Pulses in Noble Gases, Core Excitations in Ytterbium and Relativistic Systems
발행사항  
[Sl] : Purdue University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
138 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
주기사항  
Advisor: Greene, Christopher.
학위논문주기  
Thesis (Ph.D.)--Purdue University, 2024.
초록/해제  
요약This dissertation discusses theoretical methods for describing photoionization in different systems in the context of time-dependent and time-independent non-relativistic and time-independent relativistic systems. We introduce a multichannel quantum defect theory (MQDT) model for describing photoionization in the context of pump-probe experiments. The basics of MQDT are introduced and specialized to the argon atom. Two energy regimes are studied in detail and compared to the experiment: (i) a perturbative calculation describing the dynamics of an autoionizing wave packet, (ii) a time-resolved calculation describing the two-photon ionization of a deeply bound wave packet. In both cases, the model accurately describes the relative ionization with respect to the two spin-orbit split thresholds of the ion and the oscillations shown in the delay between the pump and probe. We finalize with a brief presentation, which is primarily pedagogical, of how to use MQDT inside a finite box.Next, we use MQDT to describe the ytterbium atom in different energy regimes and varying degrees of approximation. The motivation behind this lies in the context of quantum information science, but our study is only concerned with calculating atomic properties. We start with a minimal MQDT model to describe the data observed in the experiment, followed by the presentation of an ab initio two-electron model. Both models compare very well to the experiment, and the ab initio method compares favorably with older spectroscopic results. In addition, we show unpublished results that incorporate the hyper-fine effects into the approximate model.Finally, we present an implementation of the two-electron variational R-matrix method for the Dirac equation, including the complete derivation of the solution of the Dirac equation in a central potential. We provide explicit analytic forms for the solutions of the Coulomb potential and use them to derive the generalized quantum defect parameters. A discussion of the variational R-matrix method for the Dirac equation in single and multichannel contexts is presented, with sample calculations for the beryllium and radium atoms. A chapter that summarizes and points to future work for each one of the projects concludes the work.
일반주제명  
Physics
일반주제명  
Gauges
일반주제명  
Defects
일반주제명  
Spectrum analysis
일반주제명  
Fourier transforms
일반주제명  
Beryllium
일반주제명  
Lasers
일반주제명  
Energy
일반주제명  
Analytical chemistry
일반주제명  
Mathematics
일반주제명  
Optics
기타저자  
Purdue University.
기본자료저록  
Dissertations Abstracts International. 86-04B.
전자적 위치 및 접속  
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MARC

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■0820  ▼a530
■1001  ▼aBustos,  Miguel  Angel  Alarcon.
■24510▼aTheoretical  Investigations  in  Photoionization:  Ultra-Fast  Pulses  in  Noble  Gases,  Core  Excitations  in  Ytterbium  and  Relativistic  Systems
■260    ▼a[Sl]▼bPurdue  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a138  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  B.
■500    ▼aAdvisor:  Greene,  Christopher.
■5021  ▼aThesis  (Ph.D.)--Purdue  University,  2024.
■520    ▼aThis  dissertation  discusses  theoretical  methods  for  describing  photoionization  in  different  systems  in  the  context  of  time-dependent  and  time-independent  non-relativistic  and  time-independent  relativistic  systems.  We  introduce  a  multichannel  quantum  defect  theory  (MQDT)  model  for  describing  photoionization  in  the  context  of  pump-probe  experiments.  The  basics  of  MQDT  are  introduced  and  specialized  to  the  argon  atom.  Two  energy  regimes  are  studied  in  detail  and  compared  to  the  experiment:  (i)  a  perturbative  calculation  describing  the  dynamics  of  an  autoionizing  wave  packet,  (ii)  a  time-resolved  calculation  describing  the  two-photon  ionization  of  a  deeply  bound  wave  packet.  In  both  cases,  the  model  accurately  describes  the  relative  ionization  with  respect  to  the  two  spin-orbit  split  thresholds  of  the  ion  and  the  oscillations  shown  in  the  delay  between  the  pump  and  probe.  We  finalize  with  a  brief  presentation,  which  is  primarily  pedagogical,  of  how  to  use  MQDT  inside  a  finite  box.Next,  we  use  MQDT  to  describe  the  ytterbium  atom  in  different  energy  regimes  and  varying  degrees  of  approximation.  The  motivation  behind  this  lies  in  the  context  of  quantum  information  science,  but  our  study  is  only  concerned  with  calculating  atomic  properties.  We  start  with  a  minimal  MQDT  model  to  describe  the  data  observed  in  the  experiment,  followed  by  the  presentation  of  an  ab  initio  two-electron  model.  Both  models  compare  very  well  to  the  experiment,  and  the  ab  initio  method  compares  favorably  with  older  spectroscopic  results.  In  addition,  we  show  unpublished  results  that  incorporate  the  hyper-fine  effects  into  the  approximate  model.Finally,  we  present  an  implementation  of  the  two-electron  variational  R-matrix  method  for  the  Dirac  equation,  including  the  complete  derivation  of  the  solution  of  the  Dirac  equation  in  a  central  potential.  We  provide  explicit  analytic  forms  for  the  solutions  of  the  Coulomb  potential  and  use  them  to  derive  the  generalized  quantum  defect  parameters.  A  discussion  of  the  variational  R-matrix  method  for  the  Dirac  equation  in  single  and  multichannel  contexts  is  presented,  with  sample  calculations  for  the  beryllium  and  radium  atoms.  A  chapter  that  summarizes  and  points  to  future  work  for  each  one  of  the  projects  concludes  the  work.
■590    ▼aSchool  code:  0183.
■650  4▼aPhysics
■650  4▼aGauges
■650  4▼aDefects
■650  4▼aSpectrum  analysis
■650  4▼aFourier  transforms
■650  4▼aBeryllium
■650  4▼aLasers
■650  4▼aEnergy
■650  4▼aAnalytical  chemistry
■650  4▼aMathematics
■650  4▼aOptics
■690    ▼a0791
■690    ▼a0605
■690    ▼a0486
■690    ▼a0405
■690    ▼a0752
■71020▼aPurdue  University.
■7730  ▼tDissertations  Abstracts  International▼g86-04B.
■790    ▼a0183
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163768▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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