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Double Inner-Shell Vacancies in Molecules

Abstract
Molecular electronic states possessing a double core-vacancy, referred to as double-core-hole (DCH) states, were predicted more than thirty years ago, to have interesting properties, which would allow one to probe matter in a much more detailed way compared to conventional single core-vacancy techniques. Though DCH states are characterized by low cross-sections compared to the dominant single-core-hole (SCH) states, which implies experimental challenges, the development of third generation synchrotron radiation (SR) facilities and X-ray free electron lasers (XFEL), in combination with advanced spectroscopy techniques, resulted recently in a significant number of scientific works reporting on the observation of different types of DCH states. Within the framework of this thesis, experimental work in terms of high resolution single channel electron spectroscopy was carried out, detecting DCH states of the form K-1L-1V, where one core electron has been ionized and the second has been excited to an unoccupied orbital V. One example concerns the case of HCl, where the experimental spectrum has been reproduced by a fit model taking into account Rydberg series within different spin-orbit multiplicities. From this analysis, the thresholds for the double ionization continua and the quantum defects for different Rydberg electrons have been extrapolated. Furthermore, electron spectra reflecting the formation of K-2V DCH states, which involve the K shells of the N and C atoms in CH3CN, have also been recorded and interpreted based on a theoretical model considering the direct (dipolar ionization - monopolar excitation) or the conjugate (dipolar excitation - monopolar ionization) nature of each observed transition. In addition, the initial and final state effects contributing to the chemical shift between the two non-equivalent C atoms have been discussed and visualized by employing a Wagner plot. Related results are reported on the formation of K-2V DCH states in SF6 and CS2. The influence of the slope of the potential energy curve on the broadening of the spectral features is discussed along with the appearance of a pronounced background. Fingerprints of nuclear dynamics upon the decay of several types of DCH states in H2O have been identified by recording the related hyper-satellite Auger spectrum. Complementary, the technique of multi-electron coincidence spectroscopy was used for the study of the formation of K-2V and K-2 DCH states in C4H10, where the latter type of DCHs with both core electrons being ejected to the continuum, has been measured directly and in the same experiment as the K-2V states.
Parts of work
KL double core hole pre-edge states of HCl, Phys. Chem. Chem. Phys. 20, 2724 (2018), ::doi::10.1039/C7CP04214K
 
Double-core-hole states in CH3CN: Pre-edge structures and chemical-shift contributions, J. Chem. Phys. 149, 134313 (2018), ::doi::10.1063/1.5047854
 
Cationic double K-hole pre-edge states of CS2 and SF6, Sci. Rep. 7, 13317 (2017), ::doi::10.1038/s41598-017-13607-6
 
Ultrafast nuclear dynamics in the doubly-core-ionized water molecule observed via Auger spectroscopy, Phys. Rev. A 98, 063403 (2018), ::doi::10.1103/PhysRevA.98.063403
 
Formation and relaxation of K-2 and K-2V double-core-hole states in C4H10, In manuscript
 
Degree
Doctor of Philosophy
University
Göteborgs universitet. Naturvetenskapliga fakulteten
Institution
Department of Physics ; Institutionen för fysik
Disputation
10:00 AM, lecture hall PJ, Fysikgården 2, Gothenburg
Date of defence
2019-06-14
E-mail
dimitris.koulentianos@physics.gu.se
URI
http://hdl.handle.net/2077/59862
Collections
  • Doctoral Theses / Doktorsavhandlingar Institutionen för fysik
  • Doctoral Theses from University of Gothenburg / Doktorsavhandlingar från Göteborgs universitet
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gupea_2077_59862_1.pdf (7.446Mb)
gupea_2077_59862_3.pdf (215.5Kb)
Date
2019-05-15
Author
Koulentianos, Dimitris
Publication type
Doctoral thesis
ISBN
978-91-7833-488-9
978-91-7833-489-6
Language
eng
Metadata
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