Nanotip-based photoelectron microgun for ultrafast LEED

Storeck, Gero; Vogelgesang, Simon; Sivis, Murat; Schäfer, Sascha; Ropers, Claus

doi:10.1063/1.4982947

Cited by 40 publications

(29 citation statements)

References 36 publications

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“…The use of sharp field emission tips triggered by fs-laser pulses [252][253][254][255][256][257][258][259][260][261][262] provides a unique alternative to reach the required transverse source coherence for the ultrafast dynamical study of large molecular structures. Low-energy fs-electron sources based on field emitters are attracting increasing interest in the community.…”

Section: Compact Ultrafast Low-energy Fed: Metallic Tip As Coherent Ementioning

confidence: 99%

“…The advances in tip-based photoemitters and nanofabrication techniques have made it possible to achieve ps-resolution with ultrafast low-energy electron diffraction (ULEED) in backscattering mode. Storeck, Vogelgesang et al [261,262] developed a novel µm-sized electron gun, which can be brought close to the investigated surface to diminish temporal broadening. The µm-sized electron source is presented in Figure 23 alongside ULEED results obtained in the study of 1T-TaS 2 .…”

Section: Compact Ultrafast Low-energy Fed: Metallic Tip As Coherent Ementioning

confidence: 99%

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Recent Advances in Ultrafast Structural Techniques

Sciaini

2019

Applied Sciences

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A review that summarizes the most recent technological developments in the field of ultrafast structural dynamics with focus on the use of ultrashort X-ray and electron pulses follows. Atomistic views of chemical processes and phase transformations have long been the exclusive domain of computer simulators. The advent of femtosecond (fs) hard X-ray and fs-electron diffraction techniques made it possible to bring such a level of scrutiny to the experimental area. The following review article provides a summary of the main ultrafast techniques that enabled the generation of atomically resolved movies utilizing ultrashort X-ray and electron pulses. Recent advances are discussed with emphasis on synchrotron-based methods, tabletop fs-X-ray plasma sources, ultrabright fs-electron diffractometers, and timing techniques developed to further improve the temporal resolution and fully exploit the use of intense and ultrashort X-ray free electron laser (XFEL) pulses.

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Section: Compact Ultrafast Low-energy Fed: Metallic Tip As Coherent Ementioning

confidence: 99%

Section: Compact Ultrafast Low-energy Fed: Metallic Tip As Coherent Ementioning

confidence: 99%

Recent Advances in Ultrafast Structural Techniques

Sciaini

2019

Applied Sciences

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“…We addressed this issue by implementing two types of very compact photoelectron guns with diameters in the millimeter [ fabricated by optical lithography and focused ion beam etching. 57 An exemplary diffraction pattern and the temporal resolution of presently 1.4 ps 27 are shown in Figs. 2e-g.…”

Section: Uleed: Ultrafast Low Energy Electron Diffractionmentioning

confidence: 99%

Structural dynamics probed by high-coherence electron pulses

et al. 2018

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“…Moreover, Ultrafast LEED (ULEED) has recently been developed in our group [9,10] to enable the investigation of dynamical phenomena on surfaces with a temporal resolution down to a picosecond. [11] The combination of high temporal resolution and surface sensitivity is also advantageous for the investigation of thermal properties at the nanoscale. [12] Specifically, the Thermal Boundary Resistance (TBR or RK in K m 2 W -1 ) [13] of interfaces becomes increasingly important as the characteristic dimensions of the system approaches the so-called Kapitza length LK = RK k, where k is the thermal conductivity in W m -1 K -1 of the bulk material.…”

Section: Introductionmentioning

confidence: 99%

Structure and Nonequilibrium Heat‐Transfer of a Physisorbed Molecular Layer on Graphene

Wit

Bunjes

Wenderoth

et al. 2020

Adv Materials Inter

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The structure of a physisorbed sub-monolayer of 1,2-bis(4-pyridyl)ethylene (bpe) on epitaxial graphene is investigated by Low-Energy Electron Diffraction and Scanning Tunneling Microscopy. Additionally, non-equilibrium heat-transfer between bpe and the surface is studied by Ultrafast Low-Energy Electron Diffraction. Bpe arranges in an oblique unit cell which is not commensurate with the substrate. Six different rotational and/or mirror domains, in which the molecular unit cell is rotated by 28±0.1 with respect to the graphene surface, are identified. The molecules are weakly physisorbed, as evidenced by the fact that they readily desorb at room temperature. At liquid nitrogen temperature, however, the layers are stable and time-resolved experiments can be performed. The temperature changes of the molecules and the surface can be measured independently through the Debye-Waller factor of their individual diffraction features. Thus, the heat flow between bpe and the surface can be monitored on a picosecond timescale. The time-resolved measurements, in combination with model simulations, show the existence of three relevant thermal barriers between the different layers. The thermal boundary resistance between the molecular layer and graphene was found to be 2±1•10-8 K m 2 W-1. Received: ((will be filled in by the editorial staff)) Revised: ((will be filled in by the editorial staff))

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Nanotip-based photoelectron microgun for ultrafast LEED

Cited by 40 publications

References 36 publications

Recent Advances in Ultrafast Structural Techniques

Recent Advances in Ultrafast Structural Techniques

Structural dynamics probed by high-coherence electron pulses

Structure and Nonequilibrium Heat‐Transfer of a Physisorbed Molecular Layer on Graphene

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