Experimental characterization of hydrogen adsorption sites for H/W(111) using low energy ion scattering

Wong, C. S.; Whaley, Josh A.; Bergstrom, Z.J.; Wirth, Brian D.; Kolasinski, Robert

doi:10.1103/physrevb.100.245405

Cited by 10 publications

(7 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These experimental multi-angle maps provide a rich picture of the helium ion channeling in a well-characterized single crystal. We find that the maps can be well understood using a shadow cone analysis, similar to that which has been applied to conventional LEIS maps [30][31][32]. This shadow cone analysis reveals that variations in the backscattering intensity profile for 3 keV He + arose from subsurface W atoms as deep as the ninth monolayer.…”

Section: Introductionmentioning

confidence: 63%

See 1 more Smart Citation

Quantitative investigation of surface structure and interatomic potential with impact-collision ion scattering spectroscopy

Wong¹,

Kolasinski²,

Whaley³

2020

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

Helium ion beam interactions with materials have important implications for magnetic confinement fusion, material modification, and helium ion microscopy. These interactions depend on the precise physics of how helium ions channel into the materials, which can vary greatly based on the local crystalline orientation. In this work, we performed a dedicated experiment to investigate helium ion channeling in a well-characterized tungsten single crystal. Time-of-flight impact-collision ion scattering spectroscopy was used to obtain multi-angle maps of the backscattering intensity for 3 keV He+ → W(111). We found that the backscattering intensity profile arising from helium ion channeling could be well described by a shadow cone analysis. This analysis revealed that subsurface W atoms as deep as the ninth monolayer contributed to the backscattering intensity profile. Binary collision approximation simulations were performed with MARLOWE to model the experimental maps with sufficient accuracy to allow for quantitative comparisons using reliability factors. These quantitative comparisons were applied to investigate how the W lattice structure and He–W interatomic potential affect the multi-angle maps.

show abstract

Section: Introductionmentioning

confidence: 63%

“…A W(111) single crystal (MaTecK) was prepared and mounted as described in reference [32]. The sample surface was ground to within 0.1 • of the (111) plane and the angle of incidence α of our sample was aligned to better than 1 • using a laser.…”

Section: Experimental Methodsmentioning

confidence: 99%

Quantitative investigation of surface structure and interatomic potential with impact-collision ion scattering spectroscopy

Wong¹,

Kolasinski²,

Whaley³

2020

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

show abstract

“…The surface termination of the MgB 2 nanosheets was investigated with LEIS and DRS. These measurements were performed with an angle-resolved ion energy spectrometer (ARIES), which has been described in detail in previous works 66 , 67 . LEIS and DRS are complementary techniques, performed simultaneously, with sensitivity to the masses of atoms in the outermost monolayers of a surface.…”

Section: Methodsmentioning

confidence: 99%

Spontaneous dynamical disordering of borophenes in MgB2 and related metal borides

Gunda

Ray

et al. 2021

Nat Commun

Self Cite

View full text Add to dashboard Cite

Layered boron compounds have attracted significant interest in applications from energy storage to electronic materials to device applications, owing in part to a diversity of surface properties tied to specific arrangements of boron atoms. Here we report the energy landscape for surface atomic configurations of MgB2 by combining first-principles calculations, global optimization, material synthesis and characterization. We demonstrate that contrary to previous assumptions, multiple disordered reconstructions are thermodynamically preferred and kinetically accessible within exposed B surfaces in MgB2 and other layered metal diborides at low boron chemical potentials. Such a dynamic environment and intrinsic disordering of the B surface atoms present new opportunities to realize a diverse set of 2D boron structures. We validated the predicted surface disorder by characterizing exfoliated boron-terminated MgB2 nanosheets. We further discuss application-relevant implications, with a particular view towards understanding the impact of boron surface heterogeneity on hydrogen storage performance.

show abstract

“…These measurements were performed with an angle-resolved ion energy spectrometer (ARIES), which has been described in detail in previous works. 63,64 LEIS and DRS are complementary techniques, performed simultane-…”

Section: Characterizationsmentioning

confidence: 99%

Spontaneous Dynamical Disordering of Borophenes in MgB2 and Related Metal Borides

Gunda

Ray

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Layered boron compounds have attracted significant interest in applications from energy storage to electronic materials to device applications, owing in part to a diversity of surface properties tied to specific arrangements of boron atoms. Here, first-principles calculations coupled with global optimization are performed to explore the energy land scape for surface atomic configurations of MgB2, a prototypical layered metal diboride. We demonstrate, that contrary to previous assumptions, multiple reconstructions are thermodynamically preferred and kinetically accessible within the exposed B surfaces in MgB2, and other layered metal diborides. Such a dynamic environment and intrinsic disordering of the B surface atoms in metal borides presents new opportunities to realize a diverse set of 2D boron structures. We validated the predicted dynamic surface disordering by characterizing exfoliated boron-terminated MgB2 nanosheets. Application-relevant implications are discussed, with a particular view towards understanding the impact of boron surface heterogeneity on hydrogen storage performance.

show abstract

Experimental characterization of hydrogen adsorption sites for H/W(111) using low energy ion scattering

Cited by 10 publications

References 52 publications

Quantitative investigation of surface structure and interatomic potential with impact-collision ion scattering spectroscopy

Quantitative investigation of surface structure and interatomic potential with impact-collision ion scattering spectroscopy

Spontaneous dynamical disordering of borophenes in MgB2 and related metal borides

Spontaneous Dynamical Disordering of Borophenes in MgB2 and Related Metal Borides

Contact Info

Product

Resources

About