High-resolution study of the correlation satellites in photoelectron spectra of the rare gases

Kikas, Arvo; Osborne, S. J.; Ausmees, A.; Svensson, S.; Sairanen, O.‐P.; Aksela, S.

doi:10.1016/0368-2048(95)02552-9

Cited by 125 publications

(153 citation statements)

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“…In the autoionization spectrum of Fig. 3(a), this is manifested by a series of strong peaks (3,7,11,13,(15)(16)(17)(18) corresponding to ( 1 D)nd 2 S → 3 P 2 transitions. A copy of this series (peaks 1,5,6,8-10) can also be discerned for n = 8-13, which differs for each n in energy to the original very nearly by the 3 Fig.…”

Section: B Double-ionization Processesmentioning

confidence: 97%

“…Here and subsequently, we assume an energy of 38.3594 eV for the 3 P 2 state according to the NIST database [10]. At the present photon energy of 88 eV, the most intense satellite features in the Kr photoelectron spectrum in the binding energy region 38-40 eV are attributed to the ( 1 D)nd 2 S states [13,19,20]. In the autoionization spectrum of Fig.…”

Section: B Double-ionization Processesmentioning

confidence: 99%

“…4, the distributions for the formation of the states related to the 4p 4 configuration are shown on a singleionization energy scale. The photoelectron spectrum of Kr in the ionization energy region 42-65 eV was included already in the study by Kikas et al [13] and is very complex. The many overlapping spectral features make assignments difficult.…”

Section: B Double-ionization Processesmentioning

confidence: 99%

“…Assignments of most of the lines, based upon data from high-resolution optical spectroscopy collected in the NIST database [10] and upon Auger electron spectroscopy studies [11,12], provide a much more complete characterization of the process than before. At the chosen photon energy, the Kr photoelectron spectrum [13] shows a strong ( 1 D)nd 2 S series of satellites, as well as a complicated satellite spectrum in the binding-energy region above 40 eV. Their influence on the formation of the states derived from the 4p 4 ground-state configuration is investigated in detail and shows remarkable selectivity in the autoionization branching.…”

Section: Introductionmentioning

confidence: 98%

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Complete double valence photoionization study of the electron spectra of krypton

et al. 2013

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Section: B Double-ionization Processesmentioning

confidence: 97%

Section: B Double-ionization Processesmentioning

confidence: 99%

Section: B Double-ionization Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Complete double valence photoionization study of the electron spectra of krypton

et al. 2013

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“…In each stripe the electron pair exhibits both a continuous energy distribution characteristic of direct DI and discrete peaks due to indirect processes. The simulation uses spectroscopic data 7,15,16 and takes into account our experimental parameters (see Supplementary Methods). The excellent agreement between experimental and simulated spectra allows us to unambiguously identify the majority of the observed features.…”

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confidence: 99%

Double ionization probed on the attosecond timescale

et al. 2014

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Double ionization following the absorption of a single photon is one of the most fundamental processes requiring interaction between electrons 1-3 . Information about this interaction is usually obtained by detecting emitted particles without access to real-time dynamics. Here, attosecond light pulses 4,5 , electron wave packet interferometry 6 and coincidence techniques 7 are combined to measure electron emission times in double ionization of xenon using single ionization as a clock, providing unique insight into the two-electron ejection mechanism. Access to many-particle dynamics in real time is of fundamental importance for understanding processes induced by electron correlation in atomic, molecular and more complex systems.The emergence of attosecond science (1 as = 10 −18 s) in the new millennium opened an exciting area of physics bringing the dynamics of electron wave functions into focus. The important goal of real-time visualization of the interplay between electrons and their role in molecular bonding now seems to be in reach. After a decade where attosecond light sources 4,5 were characterized and their potential demonstrated, the next phase will include the exploration of correlated electron dynamics in complex systems. A series of ground-breaking studies on single ionization (SI) in atoms using attosecond light pulses sheds light on the escaping electron and its interaction with the residual ion 6,8 , and the resulting coherent superposition of neutral bound states 9,10 . Double ionization (DI) by absorption of a single photon is an inherently more challenging phenomenon, both experimentally and theoretically 1-3 . The two-electron ejection can be understood only through interactions between electrons, and is usually discussed in terms of different mechanisms 11 . In the knockout mechanism, the electron excited by interaction with the light field (the photoelectron) collides with another electron on its way out, resulting in two emitted electrons. In the shake-off mechanism, orbital relaxation following the creation of a hole ionizes a second electron. Electron correlations may also lead to indirect DI processes via highly excited states of the singly-charged ion 12 . One-photon experimental investigations with the pair of electrons detected in coincidence can provide a fairly complete DI description without, however, following the dynamics of the electron correlation in real time. Multiphoton experimental investigations have been performed both on the femtosecond and attosecond timescales 13,14 , but DI in strong laser fields does not require electron correlation.In this work, we study DI of xenon in the near-threshold region using attosecond extreme ultraviolet (XUV) pulses for excitation and multi-electron coincidence techniques to disentangle SI and DI events. Using an interferometric technique with a weak infrared laser field, we demonstrate the existence of different ionization mechanisms and get new insight into the quantum dynamics of one-photon DI with evidence for inter-shell correlation e...

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Understanding Electron Correlation: Recent Progress in Molecular Synchrotron Photoelectron Spectroscopy

Bawagan

Davidson

1999

Advances in Chemical Physics

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High-resolution study of the correlation satellites in photoelectron spectra of the rare gases

Cited by 125 publications

References 54 publications

Complete double valence photoionization study of the electron spectra of krypton

Complete double valence photoionization study of the electron spectra of krypton

Double ionization probed on the attosecond timescale

Understanding Electron Correlation: Recent Progress in Molecular Synchrotron Photoelectron Spectroscopy

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