Femtosecond dynamics of adsorbate charge-transfer processes as probed by high-resolution core-level spectroscopy

Keller, C.; Stichler, M.; Comelli, Giovanni; Esch, F.; Lizzit, Silvano; Menzel, D.; Würth, W.

doi:10.1103/physrevb.57.11951

Cited by 68 publications

(25 citation statements)

References 17 publications

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“…This novel element-specific synchrotron-based core-hole clock spectroscopy method, has been successfully used to investigate electron transfer at the interfaces of rare-gas molecules on various metal substrates [102][103][104][105], CO on Ru(001) [106], N 2 on graphite [107], C 60 on Al(110) [90] and copper(II) phthalocyanine (CuPc) on Au (111) [108] in the sub-fs timescale. It has recently been used in the study of sub-3-fs interface electron transfer for an aromatic adsorbate on TiO 2 (110) [109], the effects of functional group [97], and molecular orientation [60] on the ultrafast charge transfer at the interface between self-assembled aromatic thiols and Au (111), and excited electron transfer at the organic heterojunction interface between C 60 and Zntetraphenyl-porphyrin (ZnTPP) [110].…”

Section: Core Hole Clock Techniquementioning

confidence: 99%

“…It is clear that charge transfer for Ar on Cu (111), and Ag (111) with a timescale of about 7 fs is slower than for Ar on Ni (111). For Ar adsorbed on metal surfaces, the charge transfer time for Ar on Ru(001) [103,104] is approximately 1.5 fs.…”

Section: Gas Moleculesmentioning

confidence: 99%

“…An interesting series of resonant photoemission experiments have been done on the Ar/Ru(001) system, with spacer layers of Xe, O and CO [103,104,116]. Fig.…”

Section: Gas Moleculesmentioning

confidence: 99%

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Charge transfer across the molecule/metal interface using the core hole clock technique

Wang

Chen

Wee

2008

Surface Science Reports

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Section: Core Hole Clock Techniquementioning

confidence: 99%

Section: Gas Moleculesmentioning

confidence: 99%

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Charge transfer across the molecule/metal interface using the core hole clock technique

Wang

Chen

Wee

2008

Surface Science Reports

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“…We investigate monolayers of Ar on in-plane magnetized thin films of Ni(111), Co(0001), and Fe(110) on a W(110) substrate. We have chosen physisorbed Ar because it has been a model system in the development of CHC; its behavior is known in great detail [21][22][23][24][25][26][27][28][29]. We believe that spin selective CHC of adsorbates on magnets can be done in different ways.…”

mentioning

confidence: 99%

Spin-Dependent Electron Transfer Dynamics Probed by Resonant Photoemission Spectroscopy

et al. 2014

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Resonant photoemission spectroscopy has been used to investigate the spin-dependent electron transport from core-excited argon monolayers to ferromagnetic substrates with subfemtosecond precision. Charge transfer times as a function of the spin of the resonantly excited electron and the magnetization of the substrate have been studied for Ar=Feð110Þ, Ar=Coð0001Þ, and Ar=Nið111Þ. For argon adsorbed on iron and cobalt, a significantly faster charge transfer is found for minority electrons, whereas no such spin dependence is obtained for nickel. The results are explained considering the different empty densities of states of the metals for minority and majority electrons.

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“…A prototype system for systematic studies of electron transfer from an adsorbate into a metal substrate in the past has been Argon [2,3,7,[12][13][14][15][16][17]. Resonantly exciting an Ar 2p 3/2 core electron into the empty Ar 4s level creates a core-excited state (Ar 2p 5 4s 1 ), which for Ar adsorbed on a metal surface typically is energetically located a few eV below the ionization threshold.…”

Section: Electron Stabilizationmentioning

confidence: 99%

Electron Transfer Investigated by X‐Ray Spectroscopy

Würth

Föhlisch

2010

Dynamics at Solid State Surfaces and Interfaces

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Electron transfer at surfaces and interfaces plays an important role in many different processes such as catalytic, biophysical, electrochemical, and photoinduced reactions, molecular electronics, and solar energy conversion. Transfer can occur either resonantly or inelastically, involving more than one electron. Transfer processes occur typically on femtosecond and subfemtosecond timescales for systems where the available density of states is high such as metals. To study the fundamental aspects of the dynamics of electron transfer, it is convenient to create an electron wave packet by photoexcitation and follow its evolution by suitable probe techniques. X-rays are particularly well suited in this respect because they allow site-and element-specific localized excitations in complex systems, lead to direct excitation to a specific state, and can probe the subsequent evolution of this particular state.In this chapter, we will focus on two very different approaches using soft X-rays to investigate electron transfer, namely, high-resolution core hole spectroscopy at thirdgeneration synchrotron sources, the so-called core hole clock method [1-3], and stroboscopic pump-probe experiments using ultrashort X-ray pulses from free electron laser sources. The examples that are chosen to illustrate the potential of X-ray spectroscopy to study electron transfer are taken exclusively from our own recent work. Hence, this is by no means meant to be an extensive and representative review of the field. Core Hole Clock SpectroscopyThe term core hole clock spectroscopy reflects the fact that in this type of spectroscopy, the intrinsic lifetime of a core hole state is used as an internal reference against which competing relaxation processes are timed. Basically, the decay of a resonantly excited core hole state is studied spectroscopically (excellent reviews with many references can be found in the literature [4][5][6][7]). We will discuss here only the nonradiative decay channels, which for core hole states created by the absorption of soft X-rays represent the majority of decay channels.

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Femtosecond dynamics of adsorbate charge-transfer processes as probed by high-resolution core-level spectroscopy

Cited by 68 publications

References 17 publications

Charge transfer across the molecule/metal interface using the core hole clock technique

Charge transfer across the molecule/metal interface using the core hole clock technique

Spin-Dependent Electron Transfer Dynamics Probed by Resonant Photoemission Spectroscopy

Electron Transfer Investigated by X‐Ray Spectroscopy

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