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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Potential Due to a Magnetized Object01:24

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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Thermodynamics: Chemical Potential and Activity01:10

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The effective concentration of a species in a solution can be expressed precisely in terms of its activity. Activity considers the effect of electrolytes present in the vicinity of the species of interest and depends on the ionic strength of the solution. The activity of a species is expressed as the product of molar concentration and the activity coefficient of the species.
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Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry
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Regional chemical potential analysis for material surfaces.

Masahiro Fukuda1, Masato Senami2, Yoshiaki Sugimoto3

  • 1Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.

The Journal of Chemical Physics
|February 26, 2026
PubMed
Summary
This summary is machine-generated.

We introduce a local regional chemical potential (RCP) method to analyze atomic adsorption and chemical bonding forces in atomic force microscopy (AFM). This approach visualizes electron-donating surface regions, enhancing AFM image interpretation.

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Area of Science:

  • Surface science
  • Chemical physics
  • Materials science

Background:

  • Atomic Force Microscopy (AFM) requires advanced methods for quantitative analysis of surface interactions.
  • Understanding chemical bonding forces is crucial for interpreting high-resolution AFM images.

Purpose of the Study:

  • To develop a novel Local Regional Chemical Potential (RCP) analysis method.
  • To quantitatively estimate adsorption selectivity and chemical bonding forces in AFM.
  • To visualize electron-donating regions on surfaces.

Main Methods:

  • Development of an energy window scheme for RCP analysis.
  • Application of the RCP method to a hydrogen molecule (H2) model for covalent bonding.
  • Density Functional Theory (DFT) calculations on molecular systems and diamond C(001) surfaces.

Main Results:

  • Demonstrated a clear relationship between chemical bonding forces and local RCP using an H2 model.
  • Local RCP successfully visualized electron-donating regions like dangling and double bonds on surfaces.
  • The RCP method shows promise for analyzing high-resolution AFM images.

Conclusions:

  • The proposed local RCP analysis is an effective tool for quantitative interpretation of AFM images.
  • RCP analysis provides a practical and computationally efficient alternative to existing methods like Tersoff-Hamann.
  • This method enhances the understanding of surface chemical interactions in AFM measurements.