Development of soft x-ray time-resolved photoemission spectroscopy system with a two-dimensional angle-resolved time-of-flight analyzer at SPring-8 BL07LSU

Ogawa, M.; Yamamoto, Susumu; Kousa, Yuka; Nakamura, Fúmitaka; Yukawa, Ryu; Fukushima, Akiko; Harasawa, Ayumi; Kondoh, Hiroshi; Tanaka, Yoshihito; Kakizaki, Akito; Matsuda, Iwao

doi:10.1063/1.3687428

Cited by 52 publications

(35 citation statements)

References 16 publications

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“…In contrast to the free-electron laser measurements described in Sec. II A, the synchrotron measurements at SPring-8 were performed with picosecond x-ray pulses (∼50 ps) at much higher repetition rates 48 (∼500 MHz), resulting in that more than one pulse probe the same volume and that much lower fluences are obtained than at the free-electron laser. Hence, the fluence measurements are very different from the previous study by Schreck et al 37 using LCLS to probe valence-hole reabsorption.…”

Section: Experimental Setup At Bl17su and Bl07lsu Spring-8mentioning

confidence: 99%

X-ray emission spectroscopy of bulk liquid water in “no-man’s land”

Sellberg

McQueen

Laksmono

et al. 2015

The Journal of Chemical Physics

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The structure of bulk liquid water was recently probed by x-ray scattering below the temperature limit of homogeneous nucleation (T H ) of ∼232 K [J. A. Sellberg et al., Nature 510, 381-384 (2014)]. Here, we utilize a similar approach to study the structure of bulk liquid water below T H using oxygen K-edge x-ray emission spectroscopy (XES). Based on previous XES experiments [T. Tokushima et al., Chem. Phys. Lett. 460, 387-400 (2008)] at higher temperatures, we expected the ratio of the 1b 1 ′ and 1b 1 ′′ peaks associated with the lone-pair orbital in water to change strongly upon deep supercooling as the coordination of the hydrogen (H-) bonds becomes tetrahedral. In contrast, we observed only minor changes in the lone-pair spectral region, challenging an interpretation in terms of two interconverting species. A number of alternative hypotheses to explain the results are put forward and discussed. Although the spectra can be explained by various contributions from these hypotheses, we here emphasize the interpretation that the line shape of each component changes dramatically when approaching lower temperatures, where, in particular, the peak assigned to the proposed disordered component would become more symmetrical as vibrational interference becomes more important. C 2015 AIP Publishing LLC. [http://dx

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Section: Experimental Setup At Bl17su and Bl07lsu Spring-8mentioning

confidence: 99%

X-ray emission spectroscopy of bulk liquid water in “no-man’s land”

Sellberg

McQueen

Laksmono

et al. 2015

The Journal of Chemical Physics

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“…When measuring the transient SPV at the Si (111) 7 × 7 surface the dark carrier lifetime was in excess of the time window, and so a multi-pulse model was required to fit the carrier dynamics since the observed SPV transient was influenced by the residual SPV induced by preceding laser pump pulses [10]. Recently the use of angle-resolved time-of-flight (ARToF) analysers (such as at the BL07LSU beamline at SPring-8, Japan [14]), has allowed synchronisation of the pump laser pulse with hybrid mode pulses in multiple synchrotron periods, enabling SPV measurements extending to μs timescales, in studies of Si (111) [14][15][16], ZnO (0001) [17], and TiO 2 (110) [18].…”

Section: Introductionmentioning

confidence: 99%

“…By varying the time delay between the laser pump and XPS probe, the recombination dynamics is monitored over time, because the band bending and core level binding energies return to equilibrium as carriers recombine. Thus the recombination dynamics at the surface are elucidated [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Chemically-specific time-resolved surface photovoltage spectroscopy: Carrier dynamics at the interface of quantum dots attached to a metal oxide

et al. 2015

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a b s t r a c t a r t i c l e i n f oAvailable online xxxx Keywords: Surface photovoltage Time-resolved photoemission Semiconductor surface Carrier dynamics Photovoltaics Colloidal quantum dotsWe describe a new experimental pump-probe methodology where a 2D delay-line detector enables fast (ns) monitoring of a narrow XPS spectrum in combination with a continuous pump laser. This has been developed at the TEMPO beamline at Synchrotron SOLEIL to enable the study of systems with intrinsically slow electron dynamics, and to complement faster measurements that use a fs laser as the pump. We demonstrate its use in a time-resolved study of the surface photovoltage of the m-plane ZnO (1010) surface which shows persistent photoconductivity, requiring monitoring periods on ms timescales and longer. We make measurements from this surface in the presence and absence of chemically-linked quantum dots (QDs), using type I PbS and type II CdSe/ZnSe (core/shell) QDs as examples. We monitor signals from both the ZnO substrate and the bound QDs during photoexcitation, yielding evidence for charge injection from the QDs into the ZnO. The chemical specificity of the technique allows us to observe differences in the extent to which the QD systems are influenced by the field of the surface depletion layer at the ZnO surface, which we attribute to differences in the band structure at the interface.

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“…The time resolution of MCP is rather fast and better than 200 ps. 25,26) A fluorescence screen shows a long afterglow with a 10% decay time of 0.2 s-1 ms.…”

Section: Overview Of Electron Detectorsmentioning

confidence: 99%

Time-Resolved Photoelectron Spectroscopies Using Synchrotron Radiation: Past, Present, and Future

Yamamoto

Matsuda

2013

J. Phys. Soc. Jpn.

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We present a review on a variety of time-resolved photoelectron spectroscopies (PES) using synchrotron radiation, which can reveal dynamical processes in a wide range of time scale from second to sub-femtosecond by taking advantage of time resolution of detectors or light sources or electronic transitions in matter. As a representative example of light source-based time-resolved PES, the newly developed time-resolved PES system at SPring-8 BL07LSU is introduced along with studies of carrier dynamics on a semiconductor surface. In addition, future direction of time-resolved PES furthered by the recent advances of light sources such as x-ray free electron laser will be discussed.

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Development of soft x-ray time-resolved photoemission spectroscopy system with a two-dimensional angle-resolved time-of-flight analyzer at SPring-8 BL07LSU

Cited by 52 publications

References 16 publications

X-ray emission spectroscopy of bulk liquid water in “no-man’s land”

X-ray emission spectroscopy of bulk liquid water in “no-man’s land”

Chemically-specific time-resolved surface photovoltage spectroscopy: Carrier dynamics at the interface of quantum dots attached to a metal oxide

Time-Resolved Photoelectron Spectroscopies Using Synchrotron Radiation: Past, Present, and Future

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