Strong Circular Dichroism in Photoelectron Diffraction from Nonchiral, Nonmagnetic Material–Direct Observation of Rotational Motion of Electrons

Daimon, Hiroshi; Nakatani, Takeshi; Imada, S.; Suga, S.; Kagoshima, Yasushi; Miyahara, Tsuneaki

doi:10.1143/jjap.32.l1480

Cited by 113 publications

(56 citation statements)

References 9 publications

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“…where k is the photoelectron wave number, R the internuclear distance between the emitter atom and the scatterer atom, and y is the angle between the photon incident direction and the outgoing photoelectron direction [1,14,18]. When the position vector of the scatterer viewed from the emitter is described as ðR; y; fÞ, the peak positions observed by using circularly polarized light appear at ðy; f AE DfÞ.…”

Section: Resultsmentioning

confidence: 99%

“…The rotation of forward focusing peaks in photoelectron intensity angular distribution (PIAD) patterns obtained by clockwise (cw) and counterclockwise (ccw) helicity circularly polarized light are found to be the same as the parallax in stereo view. Taking advantage of this phenomenon of circularly polarized PIAD a stereo atomscope [1,2], and direct stereoscopic recognition of atomic arrangement around a specific atom has become possible. Furthermore, since photoelectrons are used for probing, this technique is element selective.…”

Section: Introductionmentioning

confidence: 99%

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Stereophotographs of diamond and graphite

Mukuda

Harada

Kimura

et al. 2006

Science and Technology of Advanced Materials

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The direct imaging of atomic arrangement is essential for investigation of materials science. The rotation of forward focusing peaks in photoelectron intensity angular distribution (PIAD) pattern excited by circularly polarized light with the opposite helicities is found to be the same as the parallax in stereo view. Taking advantage of this phenomenon of PIAD circular dichroism, the three-dimensional atomic arrangement visualization of diamond and graphite crystal was realized. Taking a stereo picture around carbon atom, which has been thought difficult due to a small angular momentum and scattering cross section of photoelectron, proved that this method is applicable to various materials consisting of light elements. Furthermore, the local boron dopant site was concluded to be mainly substitutional one from the comparison of B 1s and C 1s PIAD patterns. r

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stereophotographs of diamond and graphite

Mukuda

Harada

Kimura

et al. 2006

Science and Technology of Advanced Materials

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“…The shift Δ is inversely proportional to the interatomic distance between the photoelectron emitter and the scattering atoms. Thus, the local stereoscopic atomic arrangements can be imaged directly with a stereograph which consists of a pair of PIADs excited by CPL [5,[15][16][17].…”

Section: Angular Momentum Of the Photoelectronmentioning

confidence: 99%

Circular Dichroism in Cu Resonant Auger Electron Diffraction

Matsui

Maejima

Matsui

et al. 2015

Zeitschrift Für Physikalische Chemie

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Upon a core level excitation by circularly polarized light (CPL), the angular momentum of light, i.e. helicity, is transferred to the emitted photoelectron. This phenomenon can be confirmed by the parallax shift measurement of the forward focusing peak (FFP) direction in a stereograph of the atomic arrangement. The angular momentum of the emitted photoelectron is the sum of CPL helicity and the magnetic quantum number (MQN) of the initial state that define the quantum number of the core hole final state. The core hole may decay via Auger electron emission, where in this two electron process the angular momentum has to be conserved as well. Starting from a given core hole, different Auger decay channels with different final state energies and angular momenta of the emitted Auger electrons may be populated. Here we report the observation and formulation of the angular momentum transfer of light to Auger electrons, instead of photoelectrons. We measured photoelectron and Auger electron intensity angular distributions from Cu(111) and Cu(001) surfaces as a function of photon energy and photoelectron kinetic energy. By combining Auger electron spectroscopy with the FFP shift measurements at absorption threshold, element-and MQN-specific hole states can be generated in the valence band. Abstract: Upon a core level excitation by circularly polarized light (CPL), the angular momentum of light, i.e. helicity, is transferred to the emitted photoelectron. This phenomenon can be confirmed by the parallax shift measurement of the forward focusing peak (FFP) direction in a stereograph of the atomic arrangement. The angular momentum of the emitted photoelectron is the sum of CPL helicity and the magnetic quantum number (MQN) of the initial state that define the quantum number of the core hole final state. The core hole may decay via Auger electron emission, where in this two electron process the angular momentum has to be conserved as well. Starting from a given core hole, different Auger decay channels with different final state energies and angular momenta of the emitted Auger electrons may be populated. Here we report the observation and formulation of the angular momentum transfer of light to Auger electrons, instead of photoelectrons. We measured photoelectron and Auger electron intensity angular distributions from Cu(111) and Cu(001) surfaces as a function of photon energy and photoelectron kinetic energy. By combining Auger electron spectroscopy with

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“…4(a) and 4(c)). In fact, in combination with CP excitation, it is well known that circular dichroism in photoelectron angular distributions (CDAD) arises 29,30 , with these effects also being describable in terms of forward scattering peak "rotations" in angle in the direction of rotation of the electric field vector 30 . Such rotation effects are obvious in the full-hemisphere multiple scattering calculations shown in Fig.…”

Section: Ivc Circular Dichroism Effectsmentioning

confidence: 99%

Observation and resonant x-ray optical interpretation of multi-atom resonant photoemission effects in O1semission from NiO

et al. 2006

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ABST RACTWe present experimental and theoretical results for the variation of the O 1s intensity from a NiO(001) surface as the excitation energy is varied through the Ni 2p 1/2,3/2 absorption resonances, and as the incidence angle of the radiation is varied from grazing to larger values. For grazing incidence, a strong multi-atom resonant photoemission (MARPE) effect is seen on the O 1s intensity as the Ni 2p resonances are crossed, but its magnitude decreases rapidly as the incidence angle is increased. Resonant x-ray optical (RXRO) calculations are found to predict these effects very well, although the experimental effects are found to decrease at higher incidence angles faster than those in theory. The potential influence of photoelectron diffraction effects on such measurements are also considered, including experimental data with azimuthal-angle variation and corresponding multiple-scatteringdiffraction calculations, but we conclude that they do not vary beyond what is expected on the basis of the change in photoelectron kinetic energy. Varying from linear polarization to circular polarization is found to enhance these effects in NiO considerably, although the reasons are not clear. We also discuss the relationship of these measurements to other related interatomic resonance experiments and theoretical developments, and make some suggestions for future studies in this area.2

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Strong Circular Dichroism in Photoelectron Diffraction from Nonchiral, Nonmagnetic Material–Direct Observation of Rotational Motion of Electrons

Cited by 113 publications

References 9 publications

Stereophotographs of diamond and graphite

Stereophotographs of diamond and graphite

Circular Dichroism in Cu Resonant Auger Electron Diffraction

Observation and resonant x-ray optical interpretation of multi-atom resonant photoemission effects in O1semission from NiO

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