Photoionization of Atoms
Photoionization is a process of ionization by photons. It is one of the most important processes for studying astronomical objects. This Special Issue will provide an overview of photoionization, characteristic features, data availability, and the methodologies used to study these topics both experi...
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| Médium: | E-kniha |
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| Jazyk: | angličtina |
| Vydáno: |
Basel
MDPI - Multidisciplinary Digital Publishing Institute
2024
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| ISBN: | 3725826722, 9783725826728, 9783725826711, 3725826714 |
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| Abstract | Photoionization is a process of ionization by photons. It is one of the most important processes for studying astronomical objects. This Special Issue will provide an overview of photoionization, characteristic features, data availability, and the methodologies used to study these topics both experimentally and theoretically. Photoionization proceeds directly, exhibiting a smooth background, through a two-step process when an autoionizing state forms before ionization, introducing resonances. Only one theoretical approach, close coupling approximation, reproduces resonances along with the background. Theoretical studies have the advantage of covering a wide energy range and many excited states. Hence, much more theoretical research has been carried out in comparison to experiments, which are limited by the number of sophisticated set-ups required. Experimentation is challenging. The now-surpassed third-generation synchrotron facilities gave access to high photon flux. However, founding agencies often prefer to support applied research because of the relatively immediate and abundant number of publications associated with the lack of a profound understanding. This Special Issue hopes to change this attitude. |
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| AbstractList | Photoionization is a process of ionization by photons. It is one of the most important processes for studying astronomical objects. This Special Issue will provide an overview of photoionization, characteristic features, data availability, and the methodologies used to study these topics both experimentally and theoretically. Photoionization proceeds directly, exhibiting a smooth background, through a two-step process when an autoionizing state forms before ionization, introducing resonances. Only one theoretical approach, close coupling approximation, reproduces resonances along with the background. Theoretical studies have the advantage of covering a wide energy range and many excited states. Hence, much more theoretical research has been carried out in comparison to experiments, which are limited by the number of sophisticated set-ups required. Experimentation is challenging. The now-surpassed third-generation synchrotron facilities gave access to high photon flux. However, founding agencies often prefer to support applied research because of the relatively immediate and abundant number of publications associated with the lack of a profound understanding. This Special Issue hopes to change this attitude. |
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| Editor | Nahar, Sultana N Hinojosa, Guillermo |
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| Snippet | Photoionization is a process of ionization by photons. It is one of the most important processes for studying astronomical objects. This Special Issue will... |
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| SubjectTerms | Astronomy, space and time atomic beam atomic data atomic processes in plasma autoionization autoionizing resonances broad emission bumps chlorine ion Debye–Hückel effective charges energies Er I-IV excited state ground state inner-shell excitation lanthanide ions - Ho I-III local thermodynamic equilibrium (LTE) Lu I-VII massive stars Mathematics and Science merged-beams technique multiconfiguration method nLTE opacity optogalvanic phosphorus isoelectronic ion Cl IV photo-absorption photo-excitation cross-sections photoabsorption photoabsorption spectra photoionization photoionization cross-sections plasma broadening quantum defect R-matrix method radiative attachment recombination Reference, Information and Interdisciplinary subjects relativistic multi-configurations interaction Research and information: general resonance energy resonances Rydberg series saturation technique scattering functions SCUNC stars stellar atmospheres time-of-flight mass spectrometry Tm I-V transition parameters Wolf–Rayet stars Yb I-VI α and β emissions |
| Title | Photoionization of Atoms |
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