Experimental Investigation of Core-Valence Double Photoionization

Hikosaka, Y.; Aoto, Tomohiro; Lablanquie, P.; Penent, F.; Shigemasa, E.; Ito, Kenji

doi:10.1103/physrevlett.97.053003

Cited by 48 publications

(35 citation statements)

References 24 publications

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“…In the present investigation, the flight times of two electrons originating from the same ionization process were measured with a time reference set by the ionizing photon pulse of the ring. [18][19][20] The storage ring was operated in single bunch mode, which provides 30 ps light pulses at an interpulse period of 800.5 ns. 23 Data were recorded at the photon energies 220, 230, 240, 243, and 362.7 eV, which are well above the thresholds for creation of the S 2p hole and, the latter one, above the threshold for the C 1s hole along with a vacancy in a valence shell.…”

Section: Methodsmentioning

confidence: 99%

Core-valence double photoionization of the CS2 molecule

Andersson

Niskanen

Hedin

et al. 2010

The Journal of Chemical Physics

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Double photoionization spectra of the CS 2 molecule have been recorded using the TOF-PEPECO technique in combination with synchrotron radiation at the photon energies h = 220, 230, 240, 243, and 362.7 eV. The spectra were recorded in the S 2p and C 1s inner-shell ionization regions and reflect dicationic states formed out of one inner-shell vacancy and one vacancy in the valence region. MCSCF calculations were performed to model the energies of the dicationic states. The spectra associated with a S 2p vacancy are well structured and have been interpreted in some detail by comparison to conventional S 2p and valence photoelectron spectra. The lowest inner-shell-valence dicationic state is observed at the vertical double ionization energy 188.45 eV and is associated with a ͑2p 3/2 ͒ −1 ͑2 g ͒ −1 double vacancy. The spectrum connected to the C 1s vacancy shows a distinct line at 310.8 eV, accompanied by additional broad features at higher double ionization energies. This line is associated with a ͑C 1s͒ −1 ͑2 g ͒ −1 double vacancy.

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Section: Methodsmentioning

confidence: 99%

Core-valence double photoionization of the CS2 molecule

Andersson

Niskanen

Hedin

et al. 2010

The Journal of Chemical Physics

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“…The experiments were performed utilizing a versatile multi-electron coincidence technique based on a time-of-flight magnetic bottle spectrometer 10,20,22,29 . A key asset of this technique is the capability to reveal the energy correlation of multiple electrons originating from the same photoionization event.…”

Section: Experimental and Analysis Detailsmentioning

confidence: 99%

“…Double photoionization electron coincidence spectroscopy based on a magnetic bottle introduced by Eland et al 10 in 2003 opened up the possibility to determine the correlation of electrons with a wide range of kinetic energies. To begin with, this method was used to study valence double ionization of atoms and molecules [10][11][12][13][14][15][16][17][18][19] using a pulsed He lamp, and was subsequently applied to studies of core-valence double photoionization of atoms and molecules [20][21][22][23][24][25][26] utilizing synchrotron radiation sources. Both processes are examples of double ionization, where the two electrons emitted may share the excess energy provided by the absorbed photon arbitrarily, in contrast to fixed electron kinetic energies typically observed in cases of single core shell ionization followed by normal Auger decay.…”

Section: Introductionmentioning

confidence: 99%

Single-photon double and triple ionization of acetaldehyde (ethanal) studied by multi-electron coincidence spectroscopy

et al. 2015

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PostprintThis is the accepted version of a paper published in Chemical Physics. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Zagorodskikh, S., Zhaunerchyk, V., Mucke, M., Eland, J H., Squibb, R J. et al. (2015) Single-photon double and triple ionization of acetaldehyde (ethanal) studied by multi-electron coincidence spectroscopy. Single-photon multiple ionization processes of acetaldehyde (ethanal) have been experimentally investigated by utilizing a multi-particle coincidence technique based on the time-of-flight magnetic bottle principle, in combination with either a synchrotron radiation source or a pulsed helium discharge lamp. The processes investigated include double and triple ionization in the valence region as well as single and doubleAuger decay of core-ionized acetaldehyde. The latter are studied site-selectively for chemically different carbon core vacancies, scrutinizing early theoretical predictions specifically made for the case of acetaldehyde. Moreover, Auger processes in shake-up and core-valence ionized states are investigated. In the cases where the processes involve simultaneous emission of two electrons, the distributions of the energy sharing are presented, emphasizing either the knock-out or shake-off mechanism.a)

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“…It is perhaps not surprising on grounds of overlap that when there is an initial hole in S2s, the core-valence states deriving their intensity from emission of a S3s electron are relatively favoured, as clearly seen in the spectra. As in other cases [26][27][28][29][30] it seems that the singlet-triplet splitting is small, so with rare exceptions only a single band is seen for each configuration.…”

Section: Core-valence Double Ionisation Spectramentioning

confidence: 56%

Single and multiple photoionisation of H2S by 40–250 eV photons

Eland

Fink

Linusson

et al. 2011

Phys. Chem. Chem. Phys.

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Multi-electron coincidence measurements on photoionisation of H 2 S have been carried out at photon energies from 40 to 250 eV. They quantify molecular field effects on the Auger process in detail and in good agreement with existing theory. Spectra of core-valence double ionisation of H 2 S are presented and partially analysed. Auger decays from the core-valence states produce triply charged product spectra with unexplained and surprising intensity distributions. Triple ionisation by the double Auger process from 2p hole states shows little effect of the molecular field splitting, but includes a substantial contribution from cascade processes, some involving dissociation in intermediate states. The onset of triple ionisation at the molecular geometry is determined as 61 ± 0.5 eV.

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Experimental Investigation of Core-Valence Double Photoionization

Cited by 48 publications

References 24 publications

Core-valence double photoionization of the CS2 molecule

Core-valence double photoionization of the CS2 molecule

Single-photon double and triple ionization of acetaldehyde (ethanal) studied by multi-electron coincidence spectroscopy

Single and multiple photoionisation of H2S by 40–250 eV photons

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