Doppler Splitting of In-Flight Auger Decay of Dissociating Oxygen Molecules: The Localization of Delocalized Core Holes

Björneholm, Olle; Bäßler, M.; Ausmees, A.; Hjelte, I.; Feifel, Raimund; Wang, H.; Miron, Catalin; Piancastelli, M. N.; Svensson, S.; Sorensen, S. L.; Gel’mukhanov, Faris; Ågren, Hans

doi:10.1103/physrevlett.84.2826

Cited by 126 publications

(84 citation statements)

References 26 publications

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“…The Doppler effect in electron emission has been previously observed in the special case of ultrafast fragmentation following core excitation in isolated molecules [23][24][25] . However, the origin of such Doppler splitting is different from the present case, since it originates from the kinetic energy released by ultrafast dissociation.…”

Section: Resultsmentioning

confidence: 94%

“…In more detail, a strongly dissociative potential energy curve of a light molecule may lead to dissociation before the Auger decay and to high kinetic energies of the atomic fragments. If the geometry of the experiments allows selecting one particular direction of fragmentation, then the velocity of these core-excited fragments is either added to or subtracted from the velocity of the emitted resonant Auger electron, resulting in splitting of the Auger lines [23][24][25] . Such an observation is therefore restricted to ultrafast dissociation of molecules and is not related to the effect we have seen.…”

Section: Resultsmentioning

confidence: 99%

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Atomic Auger Doppler effects upon emission of fast photoelectrons

et al. 2014

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Studies of photoemission processes induced by hard X-rays including production of energetic electrons have become feasible due to recent substantial improvement of instrumentation. Novel dynamical phenomena have become possible to investigate in this new regime. Here we show a significant change in Auger emission following 1s photoionization of neon, which we attribute to the recoil of the Ne ion induced by the emission of a fast photoelectron. Because of the preferential motion of the ionized Ne atoms along two opposite directions, an Auger Doppler shift is revealed, which manifests itself as a gradual broadening and doubling of the Auger spectral features. This Auger Doppler effect should be a general phenomenon in high-energy photoemission of both isolated atoms and molecules, which will have to be taken into account in studies of other recoil effects such as vibrational or rotational recoil in molecules, and may also have consequences in measurements in solids.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Atomic Auger Doppler effects upon emission of fast photoelectrons

et al. 2014

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“…[42] or, in greater detail, in Fig. 17 taken from the original experimental work on this subject of Björneholm et al [43]. Such a Doppler effect had been predicted prior to Ref.…”

Section: Fig 14 Magnified 4σmentioning

confidence: 91%

“…fect, a Doppler energy splitting of the atomic Auger emission lines [43] as e.g. discernable in some of the spectral lines of Fig.…”

Section: Fig 14 Magnified 4σmentioning

confidence: 99%

Core-level spectroscopy and dynamics of free molecules

Feifel¹,

Piancastelli²

2011

Journal of Electron Spectroscopy and Related Phenomena

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A review of recent results on spectroscopy and dynamics of free molecules is presented. The experimental research reported here is mainly concerned with processes of core excitation and decay of isolated molecules, primarily investigated by resonant Auger spectroscopy. Several examples are shown concerning the interplay of the timescales of electron decay with nuclear motion involving dissociation processes, the occurrence of interference phenomena and recoil. The capability of such studies to reveal subtle details of the light-matter interaction, of the electronic structure and of the evolution of the short-lived states thus created is enlightened.

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“…The spectral line profiles in the electron energy spectra can also provide information on the ultrafast processes, such as the competition between the electronic decay and the nuclear motion. [13][14][15][16][17][18] Information on the interferences and phase shifts of the partial waves that describe the photoionization process itself 19 can also be retrieved by measuring the angular distribution of the ejected electrons with respect to the light polarization axis or to the propagation direction of the photon beam. 20 The combination of electrons and ions spectrometers in a sophisticated coincidence technique constitutes a powerful way to provide a direct view on a molecular reaction process by correlating all physical parameters of the emitted eleca) Electronic mail: liu@synchrotron-soleil.fr.…”

Section: Introductionmentioning

confidence: 99%

Design of a lens table for a double toroidal electron spectrometer

Liu

Nicolas

Miron

2013

Review of Scientific Instruments

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We report here on the method we developed to build a lens table for a four-element electrostatic transfer lens operated together with a double toroidal electron energy analyzer designed by one of us, and whose original design and further improvements are described in detail in Miron et al. [Rev. Sci. Instrum. 68, 3728 (1997)10.1063/1.1148017] and Le Guen et al. [Rev. Sci. Instrum. 73, 3885 (2002)10.1063/1.1511799]. Both computer simulations and laboratory instrument tuning were performed in order to build this lens table. The obtained result was tested for a broad range of electron kinetic energies and analyzer pass energies. Based on this new lens table, allowing to easily computer control the spectrometer working conditions, we could routinely achieve an electron energy resolution ranging between 0.6% and 0.8% of the analyzer pass energy, while the electron count rate was also significantly improved. The establishment of such a lens table is of high importance to relieve experimentalists from the tedious laboring of the lens optimization, which was previously necessary prior to any measurement. The described method can be adapted to any type of electron/ion energy analyzer, and will thus be interesting for all experimentalists who own, or plan to build or improve their charged particle energy analyzers.

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Doppler Splitting of In-Flight Auger Decay of Dissociating Oxygen Molecules: The Localization of Delocalized Core Holes

Cited by 126 publications

References 26 publications

Atomic Auger Doppler effects upon emission of fast photoelectrons

Atomic Auger Doppler effects upon emission of fast photoelectrons

Core-level spectroscopy and dynamics of free molecules

Design of a lens table for a double toroidal electron spectrometer

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