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

2008 ◽  
Vol 63 (11) ◽  
pp. 465-486 ◽  
Author(s):  
Li Wang ◽  
Wei Chen ◽  
Andrew Thye Shen Wee
Keyword(s):  
Charge Transfer ◽  
Metal Interface ◽  
Core Hole ◽  
The Core

Understanding ultrafast charge transfer processes in SnS and SnS2: using the core hole clock method to measure attosecond orbital-dependent electron delocalisation in semiconducting layered materials

2021 ◽  
Author(s):  
Freddy Oropeza ◽  
Mariam Barawi ◽  
Alfonso González Elena ◽  
Víctor Antonio Antonio de la Peña O'Shea ◽  
Juan Francisco Trigo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Layered Materials ◽  
Core Hole ◽  
Layered Semiconductors ◽  
The Core ◽  
Transfer Processes ◽  
Earth Abundant ◽  
Intrinsic Efficiency ◽  
Ultrafast Charge Transfer ◽  
Photocatalytic Applications

SnS and SnS2 are earth abundant layered semiconductors that owing to their optoelectronic properties have been proposed as materials for different photovoltaic, photosensing and photocatalytic applications. The intrinsic efficiency of...

Verification of the core-hole-clock method using two different time references: Attosecond charge transfer in c(4×2)S/Ru(0001)

2007 ◽  
Vol 434 (4-6) ◽  
pp. 214-217 ◽  
Author(s):  
A. Föhlisch ◽  
S. Vijayalakshmi ◽  
F. Hennies ◽  
W. Wurth ◽  
V.R.R. Medicherla ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Core Hole ◽  
The Core

scholarly journals A SERS Study of Charge Transfer Process in Au Nanorod–MBA@Cu2O Assemblies: Effect of Length to Diameter Ratio of Au Nanorods

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 867
Author(s):  
Lin Guo ◽  
Zhu Mao ◽  
Sila Jin ◽  
Lin Zhu ◽  
Junqi Zhao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Shell Structure ◽  
Shell Structures ◽  
Core Shell ◽  
Absorption Bands ◽  
Au Nanorods ◽  
The Core ◽  
Band Position ◽  
Surface Enhanced Raman ◽  
Core Shell Structure

Surface-enhanced Raman scattering (SERS) is a powerful tool in charge transfer (CT) process research. By analyzing the relative intensity of the characteristic bands in the bridging molecules, one can obtain detailed information about the CT between two materials. Herein, we synthesized a series of Au nanorods (NRs) with different length-to-diameter ratios (L/Ds) and used these Au NRs to prepare a series of core–shell structures with the same Cu2O thicknesses to form Au NR–4-mercaptobenzoic acid (MBA)@Cu2O core–shell structures. Surface plasmon resonance (SPR) absorption bands were adjusted by tuning the L/Ds of Au NR cores in these assemblies. SERS spectra of the core-shell structure were obtained under 633 and 785 nm laser excitations, and on the basis of the differences in the relative band strengths of these SERS spectra detected with the as-synthesized assemblies, we calculated the CT degree of the core–shell structure. We explored whether the Cu2O conduction band and valence band position and the SPR absorption band position together affect the CT process in the core–shell structure. In this work, we found that the specific surface area of the Au NRs could influence the CT process in Au NR–MBA@Cu2O core–shell structures, which has rarely been discussed before.

Core Level Shifts and Grain Boundary Cohesion

1998 ◽  
Vol 4 (S2) ◽  
pp. 766-767
Author(s):  
D. A. Muller
Keyword(s):  
Charge Transfer ◽  
Valence Band ◽  
Core Level ◽  
Level Shift ◽  
The Core ◽  
Metallic Interfaces ◽  
Level Shifts ◽  
Electron Energy Loss ◽  
Valence Band Width

The role of core level shifts at metallic interfaces has often been ignored in electron energy loss spectroscopy (EELS) even though very small changes in bond length can lead to large core level shifts. However, the popular interpretation of core level shifts as measures of charge transfer is highly problematic. For instance, in binary alloys systems, the core level shifts can be the same sign for both atomic constituents[l]. The simple interpretation would require that both atomic species had lost or gained charge. Further, the signs of the core level shifts can be opposite to those expected from electronegativity arguments[2]. A core level shift (CLS) is still possible, even when no charge transfer occurs. As illustrated in Fig. 1, if the valence band width is increased, the position of the center of the valence band with respect to the Fermi energy will change (as the number of electrons remains unchanged).

scholarly journals Ca and S K-edge XANES of CaS calculated by different methods: influence of full potential, core hole and Eu doping

2019 ◽  
Vol 26 (1) ◽  
pp. 152-158 ◽  
Author(s):  
Ondřej Šipr ◽  
Wilayat Khan ◽  
Yves Joly ◽  
Ján Minár
Keyword(s):  
Experimental Data ◽  
Scattering Method ◽  
Full Potential ◽  
Core Hole ◽  
Potential Core ◽  
Edge Structure ◽  
The Core ◽  
The Finite Difference Method ◽  
Multiple Scattering Method ◽  
Flapw Method

Ca and S K-edge spectra of CaS are calculated by the full-potential Green's function multiple-scattering method, by the FLAPW method and by the finite-difference method. All three techniques lead to similar spectra. Some differences remain close to the edge, both when comparing different calculations with each other and when comparing the calculations with earlier experimental data. Here it is found that using the full potential does not lead to significant improvement over the atomic spheres approximation and that the effect of the core hole can be limited to the photoabsorbing atom alone. Doping CaS with Eu will not affect the Ca and S K-edge XANES of CaS significantly but may give rise to a pre-edge structure not present for clean CaS.

SEPARATION OF INITIAL AND FINAL STATE CONTRIBUTIONS TO CHEMICAL SHIFTS IN TERMS OF A POTENTIAL MODEL

1994 ◽  
Vol 01 (04) ◽  
pp. 469-472 ◽  
Author(s):  
R.J. COLE ◽  
P. WEIGHTMAN
Keyword(s):  
Charge Transfer ◽  
Ground State ◽  
Potential Model ◽  
Chemical Shifts ◽  
Free Atom ◽  
Core Hole ◽  
Final State ◽  
State Charge ◽  
Elemental Solid

A recently developed potential model facilitates the separation of initial and final state contributions to chemical shifts in terms of ground state charge transfer and differences in core hole screening charge. The model is applied to the free atom to elemental solid shifts of the elements Na, Mg, Si, and Zn.

A theoretical investigation of the core hole states of the 2-norbornyl cation

1977 ◽  
Vol 99 (24) ◽  
pp. 8120-8121 ◽  
Author(s):  
D. T. Clark ◽  
B. J. Cromarty ◽  
L. Colling
Keyword(s):  
Theoretical Investigation ◽  
Core Hole ◽  
The Core
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