scholarly journals Quantitative electronic structure and work-function changes of liquid water induced by solute

2021 ◽  
Author(s):  
Bruno Credidio ◽  
Michele Pugini ◽  
Sebastian Malerz ◽  
Florian Trinter ◽  
Uwe Hergenhahn ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Work Function ◽  
Liquid Water ◽  
Photoelectron Spectroscopy ◽  
Accurate Determination ◽  
Liquid Jet ◽  
Major Objective ◽  
Absolute Scale ◽  
Recent Advancement

Recent advancement in quantitative liquid-jet photoelectron spectroscopy enables the accurate determination of the absolute-scale electronic energetics of liquids and species in solution. The major objective of the present work is...

scholarly journals Determination of the valence band edge of Fe oxide nanoparticles dispersed in aqueous solution through resonant photoelectron spectroscopy from a liquid microjet

2021 ◽  
Author(s):  
Giorgia Olivieri ◽  
Gregor Kladnik ◽  
Dean Cvetko ◽  
Matthew A. Brown
Keyword(s):  
Aqueous Solution ◽  
Electronic Structure ◽  
Valence Band ◽  
Photoelectron Spectroscopy ◽  
Band Edge ◽  
Photoemission Spectroscopy ◽  
Oxide Nanoparticles ◽  
Valence Band Edge ◽  
Resonant Photoemission

The electronic structure of hydrated nanoparticles can be unveiled by coupling a liquid microjet with a resonant photoemission spectroscopy.

scholarly journals Size and Concentration Determination of Colloidal Nanocrystals by Small-Angle X-Ray Scattering

2018 ◽  
Author(s):  
Jorick Maes ◽  
Nicolo Castro ◽  
Kim De Nolf ◽  
Willem Walravens ◽  
Benjamin Abécassis ◽  
...  
Keyword(s):  
Band Gap ◽  
Small Angle ◽  
Accurate Determination ◽  
Band Gap Energy ◽  
Colloidal Nanocrystals ◽  
X Ray ◽  
Absolute Scale ◽  
X Ray Scattering ◽  
Ray Scattering

<div> <div> <div> <p>The accurate determination of the dimensions of a nano-object is paramount to the de- velopment of nanoscience and technology. Here, we provide procedures for sizing quasi- spherical colloidal nanocrystals (NCs) by means of small-angle x-ray scattering (SAXS). Using PbS NCs as a model system, the protocols outline the extraction of the net NC SAXS pattern by background correction and address the calibration of scattered x-ray intensity to an absolute scale. Different data analysis methods are compared, and we show that they yield nearly identical estimates of the NC diameter in the case of a NC ensemble with a monodisperse and monomodal size distribution. Extending the analysis to PbSe, CdSe </p> </div> </div> <div> <div> <p>and CdS NCs, we provide SAXS calibrated sizing curves, which relate the NC diameter and the NC band-gap energy as determined using absorbance spectroscopy. In compari- son with sizing curves calibrated by means of transmission electron microscopy (TEM), we systematically find that SAXS calibration assigns a larger diameter than TEM calibration to NCs with a given band gap. We attribute this difference to the difficulty of accurately sizing small objects in TEM images. To close, we demonstrate that NC concentrations can be directly extracted from SAXS patterns normalized to an absolute scale, and we show that SAXS-based concentrations agree with concentration estimates based on absorption spectroscopy.</p></div></div></div>

scholarly journals Electronic structure of aqueous-phase anatase titanium dioxide nanoparticles probed by liquid jet photoelectron spectroscopy

2019 ◽  
Vol 7 (12) ◽  
pp. 6665-6675 ◽  
Author(s):  
Hebatallah Ali ◽  
Robert Seidel ◽  
Arno Bergmann ◽  
Bernd Winter
Keyword(s):  
Titanium Dioxide ◽  
Electronic Structure ◽  
Aqueous Phase ◽  
Photoelectron Spectroscopy ◽  
Titanium Dioxide Nanoparticles ◽  
Liquid Jet ◽  
Water Interaction ◽  
Ph Dependent ◽  
Dependent Mechanism

Proposed pH-dependent mechanism of TiO2–water interaction.

BBonding in minerals: the application of PAX (photoelectron and X-ray) spectroscopy to the direct determination of electronic structure

1989 ◽  
Vol 53 (370) ◽  
pp. 153-164 ◽  
Author(s):  
David S. Urch
Keyword(s):  
Electronic Structure ◽  
Valence Band ◽  
Photoelectron Spectroscopy ◽  
Direct Determination ◽  
Energy Scale ◽  
X Ray ◽  
Electron Transitions ◽  
Dipole Selection Rule ◽  
The Individual

AbstractX-ray photoelectron spectroscopy can be used to measure the ionization energies of electrons in both valence band and core orbitals. As core vacancies are the initial states for X-ray emission, a knowledge of their energies for all atoms in a mineral enables all the X-ray spectra to be placed on a common energy scale. X-ray spectra are atom specific and are governed by the dipole selection rule. Thus the individual bonding roles of the different atoms are revealed by the fine structure of valence X-ray peaks (i.e. peaks which result from electron transitions between valence band orbitals and core vacancies). The juxtaposition of such spectra enables the composition of the molecular orbitals that make up the chemical bonds of a mineral to be determined.Examples of this approach to the direct determination of electronic structure are given for silica, forsterite, brucite, and pyrite. Multi-electron effects and developments involving anisotropic X-ray emission from single crystals are also discussed.

scholarly journals The Fermi Level as an Energy Reference in Liquid Jet X-ray Photoelectron Spectroscopy Studies of Aqueous Solutions  

2021 ◽  
Author(s):  
Lucia Pérez Ramírez ◽  
Anthony Boucly ◽  
Florent Saudrais ◽  
F. Bournel ◽  
Jean-Jacques Gallet ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Aqueous Solutions ◽  
Photoelectron Spectroscopy ◽  
Photoemission Spectroscopy ◽  
Liquid Jet ◽  
X Ray ◽  
Invaluable Tool ◽  
Structure Of Aqueous Solutions ◽  
Spectroscopy Studies ◽  
Photocatalytic Processes

To advance an understanding of key electrochemical and photocatalytic processes that depend on the electronic structure of aqueous solutions, X-ray photoemission spectroscopy has become an invaluable tool, especially when practiced...

The influence of aqueous solvent on the electronic structure and non-adiabatic dynamics of indole explored by liquid-jet photoelectron spectroscopy

2018 ◽  
Vol 212 ◽  
pp. 359-381 ◽  
Author(s):  
Gaurav Kumar ◽  
Anirban Roy ◽  
Ryan S. McMullen ◽  
Shanmukh Kutagulla ◽  
Stephen E. Bradforth
Keyword(s):  
Electronic Structure ◽  
Amino Acid ◽  
Photoelectron Spectroscopy ◽  
Liquid Jet ◽  
Time Resolved ◽  
Structure And Dynamics ◽  
Aqueous Solvent ◽  
Influence Of Water ◽  
Amino Acid Tryptophan ◽  
Adiabatic Dynamics

Time-resolved photoelectron spectroscopy (TRPES) in a liquid micro-jet is implemented here to investigate the influence of water on the electronic structure and dynamics of indole, the chromophore of the amino acid tryptophan.

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