Photoelectron Spectroscopy of Size-Selected Bismuth–Boron Clusters: BiBn– (n = 6–8)

2021 ◽  
Author(s):  
Wei-Jia Chen ◽  
Maksim Kulichenko ◽  
Hyun Wook Choi ◽  
Joseph Cavanagh ◽  
Dao-Fu Yuan ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Boron Clusters

A photoelectron spectroscopy and ab initio study of B21−: Negatively charged boron clusters continue to be planar at 21

2012 ◽  
Vol 136 (10) ◽  
pp. 104310 ◽  
Author(s):  
Zachary A. Piazza ◽  
Wei-Li Li ◽  
Constantin Romanescu ◽  
Alina P. Sergeeva ◽  
Lai-Sheng Wang ◽  
...  
Keyword(s):  
Ab Initio ◽  
Photoelectron Spectroscopy ◽  
Ab Initio Study ◽  
Boron Clusters

Probing the structures and bonding of size-selected boron and doped-boron clusters

2019 ◽  
Vol 48 (13) ◽  
pp. 3550-3591 ◽  
Author(s):  
Tian Jian ◽  
Xuenian Chen ◽  
Si-Dian Li ◽  
Alexander I. Boldyrev ◽  
Jun Li ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Theoretical Calculations ◽  
Boron Clusters

Photoelectron spectroscopy in conjunction with theoretical calculations has been used to investigate size-selected boron clusters, uncovering interesting structures and bonding.

scholarly journals Monovalent lanthanide(I) in borozene complexes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wan-Lu Li ◽  
Teng-Teng Chen ◽  
Wei-Jia Chen ◽  
Jun Li ◽  
Lai-Sheng Wang
Keyword(s):  
Magnetic Properties ◽  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
Global Minimum ◽  
Theoretical Calculations ◽  
Oxidation States ◽  
State Change ◽  
Boron Clusters ◽  
Aromatic Ligand ◽  
Hydrocarbon Molecules

AbstractLanthanide (Ln) elements are generally found in the oxidation state +II or +III, and a few examples of +IV and +V compounds have also been reported. In contrast, monovalent Ln(+I) complexes remain scarce. Here we combine photoelectron spectroscopy and theoretical calculations to study Ln-doped octa-boron clusters (LnB8−, Ln = La, Pr, Tb, Tm, Yb) with the rare +I oxidation state. The global minimum of the LnB8− species changes from Cs to C7v symmetry accompanied by an oxidation-state change from +III to +I from the early to late lanthanides. All the C7v-LnB8− clusters can be viewed as a monovalent Ln(I) coordinated by a η8-B82− doubly aromatic ligand. The B73−, B82−, and B9− series of aromatic boron clusters are analogous to the classical aromatic hydrocarbon molecules, C5H5−, C6H6, and C7H7+, respectively, with similar trends of size and charge state and they are named collectively as “borozenes”. Lanthanides with variable oxidation states and magnetic properties may be formed with different borozenes.

Complexes between Planar Boron Clusters and Transition Metals: A Photoelectron Spectroscopy and Ab Initio Study of CoB12– and RhB12–

2014 ◽  
Vol 118 (37) ◽  
pp. 8098-8105 ◽  
Author(s):  
Ivan A. Popov ◽  
Wei-Li Li ◽  
Zachary A. Piazza ◽  
Alexander I. Boldyrev ◽  
Lai-Sheng Wang
Keyword(s):  
Transition Metals ◽  
Ab Initio ◽  
Photoelectron Spectroscopy ◽  
Ab Initio Study ◽  
Boron Clusters

Preferential Sputtering of Ni3Al Single Crystals Studied Using Atom-Probe Field-Ion Microscopy and XPS

1981 ◽  
Vol 39 ◽  
pp. 16-17
Author(s):  
M.P. Thomas ◽  
A.R. Waugh ◽  
M.J. Southon ◽  
Brian Ralph
Keyword(s):  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Depth Profiling ◽  
Analytical Techniques ◽  
Atom Probe ◽  
Probe Field ◽  
Preferential Sputtering ◽  
Argon Ion Bombardment ◽  
Argon Ion

It is well known that ion-induced sputtering from numerous multicomponent targets results in marked changes in surface composition (1). Preferential removal of one component results in surface enrichment in the less easily removed species. In this investigation, a time-of-flight atom-probe field-ion microscope A.P. together with X-ray photoelectron spectroscopy XPS have been used to monitor alterations in surface composition of Ni3Al single crystals under argon ion bombardment. The A.P. has been chosen for this investigation because of its ability using field evaporation to depth profile through a sputtered surface without the need for further ion sputtering. Incident ion energy and ion dose have been selected to reflect conditions widely used in surface analytical techniques for cleaning and depth-profiling of samples, typically 3keV and 1018 - 1020 ion m-2.

Spatially Resolved Photoelectron Spectroscopy: Recent Progress and Future Plans

1990 ◽  
Vol 48 (2) ◽  
pp. 388-389
Author(s):  
A. M. Bradshaw
Keyword(s):  
Photoelectron Spectroscopy ◽  
Chemical Reactivity ◽  
Target Material ◽  
Orbital Energy ◽  
Light Sources ◽  
Analytical Technique ◽  
Hartree Fock ◽  
Spatially Resolved ◽  
Koopmans Theorem ◽  
Surface Analytical Technique

X-ray photoelectron spectroscopy (XPS or ESCA) was not developed by Siegbahn and co-workers as a surface analytical technique, but rather as a general probe of electronic structure and chemical reactivity. The method is based on the phenomenon of photoionisation: The absorption of monochromatic radiation in the target material (free atoms, molecules, solids or liquids) causes electrons to be injected into the vacuum continuum. Pseudo-monochromatic laboratory light sources (e.g. AlKα) have mostly been used hitherto for this excitation; in recent years synchrotron radiation has become increasingly important. A kinetic energy analysis of the so-called photoelectrons gives rise to a spectrum which consists of a series of lines corresponding to each discrete core and valence level of the system. The measured binding energy, EB, given by EB = hv−EK, where EK is the kineticenergy relative to the vacuum level, may be equated with the orbital energy derived from a Hartree-Fock SCF calculation of the system under consideration (Koopmans theorem).

Two dimensional Sr silicate grown on Si(001) studied using X-ray Photoelectron Spectroscopy

2006 ◽  
Vol 132 ◽  
pp. 87-90
Author(s):  
M. El Kazzi ◽  
G. Delhaye ◽  
S. Gaillard ◽  
E. Bergignat ◽  
G. Hollinger
Keyword(s):  
Photoelectron Spectroscopy ◽  
Two Dimensional ◽  
X Ray
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