Related Experiment Video
Updated: Aug 10, 2025

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
XPS Core-Level Chemical Shift by Ab Initio Many-Body Theory
Iskander Mukatayev1, Florient Moevus1, Benoît Sklénard1,2
1Université Grenoble Alpes, CEA, Leti, F-38000, Grenoble, France.
X-ray photoemission spectroscopy (XPS) reveals atomic composition and chemical bonds. This study identifies classical electrostatics as the primary driver of the chemical shift in XPS, significantly impacting local structure analysis.
Area of Science:
- Materials Science
- Quantum Chemistry
- Spectroscopy
Background:
- X-ray photoemission spectroscopy (XPS) offers direct insights into atomic composition and stoichiometry.
- The chemical shift in XPS provides crucial information about local chemical environments and bonding.
Purpose of the Study:
- To theoretically investigate and compare various computational methods for calculating chemical shifts.
- To identify the dominant physical contributions to the chemical shift phenomenon.
Main Methods:
- Comparison of theoretical approaches: Hartree-Fock, density functional theory, and many-body perturbation theory (GW, COHSEX).
- Assessment of theoretical accuracy against experimental carbon 1s chemical shift data for gas-phase molecules.
Main Results:
- Classical electrostatics is identified as the largest contributor to the chemical shift, exceeding correlation effects by an order of magnitude.
- The study evaluates the predictive power of different quantum chemical methods for XPS chemical shifts.
Conclusions:
- Understanding the contributions to the chemical shift is vital for accurate interpretation of XPS data.
- Theoretical methods, particularly those including electrostatic contributions, are essential for advancing XPS analysis.
More Related Videos
07:44Determining the Chemical Composition of Corrosion Inhibitor/Metal Interfaces with XPS: Minimizing Post Immersion Oxidation
Published on: March 15, 2017
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
Related Concept Videos
π Electron Effects on Chemical Shift: Overview
NMR Spectroscopy: Chemical Shift Overview
For instance, the proton...
Chemical Shift: Internal References and Solvent Effects
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
Inductive Effects on Chemical Shift: Overview
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...