The valence photoelectron satellite spectra of Kr and Xe

Alitalo, S.; Kivimäki, A.; Matila, T.; Vaarala, K.; Aksela, H.; Aksela, S.

doi:10.1016/s0368-2048(00)00277-2

Cited by 30 publications

(36 citation statements)

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“…3(a) was observed in a photoelectron spectrum recorded at 68.5 eV by Caló et al [20]. However, it was not reported in the 125 eV study by Alitalo et al [19], and we note that peak 5 in Fig. 3(a) has no correspondence in the photoelectron spectra of either study.…”

Section: B Double-ionization Processescontrasting

confidence: 60%

“…3(a). Assignments of them are not clear cut, as many states may contribute [19,26], but in the study of Caló et al [20] the previous assignment [19] of a 1 S 6p shakeup state at a binding energy close to that of peak 2 was confirmed, and new assignments of ( 1 D)nd 2 D 3/2 states close to that of peaks 12 and 14 were made. More information on states near the apparent binding energy of peak 4 was, unfortunately, not reported in the work of Caló et al [20], but we note that it has an apparent binding energy close to the ( 1 D)8d 2 D 3/2 state, which appears strongly in threshold photoelectron spectra [27,28] and (probably) at the He II photon energies [4].…”

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%

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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 Processescontrasting

confidence: 60%

Section: B Double-ionization Processesmentioning

confidence: 97%

Section: B Double-ionization Processesmentioning

confidence: 99%

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Complete double valence photoionization study of the electron spectra of krypton

et al. 2013

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“…A reason for this discrepancy lies probably in the limitations of theoretical model used. Population of the Kr * + (4p −2 )( 1 D)nd( 2 S) Rydberg series, which are dominant according to Alitalo et al (2001) is for instance not included in our model. Our approach considers only the shake process for the excitation of a second electron of the outer shell and neglects other mechanisms which can play an important role (Chang andPoe 1975, Carter andKelly 1977).…”

Section: Comparison Of Calculated and Measured Spectramentioning

confidence: 99%

Dynamics of electron emission in double photoionization processes near the krypton 3d threshold

Penent

Sheinerman

Andrić

et al. 2008

J. Phys. B: At. Mol. Opt. Phys.

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Abstract.Two electron emission following photoabsorption near the Kr 3d threshold is investigated both experimentally and theoretically. On the experimental side, electron / electron coincidences using a magnetic bottle time of flight spectrometer allow us to observe the complete Double Photo Ionisation (DPI) continua of selected Kr 2+ final states, and to see how these continua are affected by resonant processes in the vicinity of the Kr 3d threshold. The analysis is based on a quantum mechanical approach that takes into account the contribution of three different processes: A) Auger decay of the inner 3d vacancy with the associated post collision interaction (PCI) effects, B) capture of slow photoelectrons into discrete states followed by valence multiplet decay (VMD) of the excited ionic states and C) valence shell DPI. The dominant process for each Kr 2+ (4p −2 ) final state is the photoionization of the inner shell followed by Auger decay of the 3d vacancies. Moreover, for the 4p −2 ( 3 P ) and 4p −2 ( 1 D) final ionic states an important contribution comes from the processes of slow photoelectron capture followed by VMD as well as from double ionization of the outer shell involving also VMD.Confidential: not for distribution.

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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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The valence photoelectron satellite spectra of Kr and Xe

Cited by 30 publications

References 13 publications

Complete double valence photoionization study of the electron spectra of krypton

Complete double valence photoionization study of the electron spectra of krypton

Dynamics of electron emission in double photoionization processes near the krypton 3d threshold

Double ionization probed on the attosecond timescale

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