Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

Riffe, D. M.; Franckowiak, R.T.; Shinn, Neal D.; Kim, B.; Kim, K.J.; Kang, Tai‐Hee

doi:10.1016/j.susc.2008.04.022

Cited by 6 publications

(19 citation statements)

References 92 publications

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“…The fit contains two DS-peaks (labeled B and S) that have parameters consistent with data obtained at slightly higher resolution [42]. That other components are not needed to describe this spectrum indicates that surface contamination is well below 0.01 ML [35].…”

Section: Results and Analysissupporting

confidence: 57%

“…The solid and dashed lines mark the BE's of the bulk and clean-surface atoms, respectively. As in the case of Ni deposition on W(110) [35], with increasing coverage the surface peak diminishes in height until only one peak is visible. For Pt this single peak is very close to the BE of the bulk peak, suggesting that at higher coverages the Pt influenced atoms have BE's that are close to the bulk-atom BE.…”

Section: Results and Analysismentioning

confidence: 80%

“…Related to these observations, the calculations of Weinert and Watson support the view that the substrate corelevel shifts, more than those of the adlayer, are indicative of charge rearrangement associated with bonding at the interface [16]. The second general feature associated with these bimetallic interfaces is the observation that the cp, commensurate phases of Ni/W(110) and Pt/W(110) exhibit only one core-level binding energy, 2 as discussed in detail for Ni/W(110) [35]. Briefly, this result is surprising because the commensurate nature of the overlayer means that not all surface W atoms have identical coordination to the overlayer atoms.…”

Section: General Features Of Group-10-metals/w(110) Core-level Shiftsmentioning

confidence: 78%

“…This simplicity has been utilized in a number of previous investigations of W-substrate based bimetallic interfaces [24][25][26][27][28][29][30][31][32][33][34]. Our results for Ni and Pd have recently been reported [35,36]; here we present the Pt induced shifts. In addition to the substrate core-level spectra, we have also obtained 4f spectra from the overlayer Pt atoms at a coverage of ~1 ML.…”

Section: Introductionmentioning

confidence: 87%

“…Using these new data from Pt/W(110) and previous data from Ni/W(110) [35,37] and Pd/W(110) [36][37][38], we are able to identify several general features of the corelevel spectra from all three systems. First, with respect to the core-level binding energies (BE's) of atoms at their respective clean surfaces, the core-level shifts of both the substrate and overlayer atoms are positive, and [for a pseudomorphic (ps) overlayer] the ratio of the overlayer shift to substrate shift is ~4 in all three cases.…”

Section: Introductionmentioning

confidence: 99%

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Core-level shifts at the Pt/W(110) monolayer bimetallic interface

et al. 2009

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We have measured W and Pt 4f7/2 core-level photoemission spectra from interfaces formed by ultrathin Pt layers on W(110), completing our core-level measurements of W(110)-based bimetallic interfaces involving the group-10 metals Ni, Pd, and Pt. With increasing Pt coverage the sequence of W spectra can be described using three interfacial core-level peaks with binding-energy (BE) shifts (compared to the bulk) of −0.220 ± 0.015, −0.060 ± 0.015, and +0.110 ± 0.010 eV. We assign these features to 1D, 2D pseudomorphic (ps), and 2D closed-packed (cp) Pt phases, respectively. For ~1 ps ML the Pt 4f7/2 BE is 71.40 ± 0.02 eV, a shift of +0.46 ± 0.09 eV with respect to the BE of bulk Pt metal. The W 4f7/2 core-level shifts induced by all three adsorbates are semiquantitatively described by the Born-Haber-cycle based partial-shift model of Nilsson et al. [Phys. Rev. B 38 (1988) 10357]. As with Ni/W(110), the difference in W 4f7/2 binding energies between ps and cp Pt phases has a large structural contribution. The Pt 4f lineshape is consistent with a small density of states at the Fermi level, reflective of the Pt monolayer having noble-metal-like electronic structure.

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Section: Results and Analysissupporting

confidence: 57%

Section: Results and Analysismentioning

confidence: 80%

Section: General Features Of Group-10-metals/w(110) Core-level Shiftsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Core-level shifts at the Pt/W(110) monolayer bimetallic interface

et al. 2009

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Electronic Structure and Bond Relaxation at Na/Ta(110) Interfaces and 1D‐Chain and 2D‐Ring Ta Metal Structures on Na(110)

Yao

et al. 2019

Physica Status Solidi (b)

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Combining bond–band–barrier (BBB), density‐functional theory (DFT) and zone‐selective electron spectroscopy (ZES) correlations, we investigate the bonding mechanisms at Na/Ta(110) and Ta/Na(110) interfaces. When the Ta metal coverage on the Na(110) surface is increased from 7/9 ML to 8/9 ML, the Ta surface distribution changed from one‐dimensional chains to two‐dimensional ring structures. Moreover, the Ta‐induced shifts in the surface binding energy (BE) on the Na(110) surface were dominated by quantum entrapment, whereas the Na‐induced shifts in the BE on the Ta(100) surface are dominated by polarization. DFT calculations reveal that the Ta atomic chain is more stable than the structure of the Ta atomic ring. The adsorption of Ta atoms on the Na(110) surface is more stable than the structure of the Na atoms adsorbing on the Ta(110) surface. The 1D chain formations and 2D ring structures on the Na(110) surface are identified and explained in this paper.

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