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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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Calculations of Electric Potential II01:27

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An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Electric Field of Two Equal and Opposite Charges01:30

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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
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Updated: Jun 7, 2025

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Second harmonic generation null angle polarization analysis for determining interfacial potential at charged

Celestine C Egemba1, Paul E Ohno1

  • 1Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA.

The Journal of Chemical Physics
|November 21, 2024
PubMed
Summary
This summary is machine-generated.

Quantifying interfacial electrostatics is crucial. A new nonlinear optical null ellipsometry (NONE) method uses polarization to measure interfacial potential via second harmonic generation (SHG) phase, simplifying experiments.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Nonlinear optics

Background:

  • Quantifying charged interface electrostatics is vital across scientific disciplines.
  • Second harmonic generation (SHG) is a surface-sensitive nonlinear optical technique for probing interfacial properties.
  • Measuring SHG phase, alongside amplitude, allows direct interfacial potential quantification, but experimental phase detection is challenging.

Purpose of the Study:

  • To introduce a novel polarization-based approach for recovering absolute phase information in SHG measurements.
  • To adapt the nonlinear optical null ellipsometry (NONE) technique for absolute interfacial potential quantification.
  • To assess the sensitivity and potential errors of the NONE method for interfacial potential measurements.

Main Methods:

  • Developed a new polarization-based method building on nonlinear optical null ellipsometry (NONE).
  • Utilized a symmetry relation of potential-dependent third-order susceptibility to establish an absolute phase reference.
  • Employed simulated data of the silica:water interface to explore sensitivity to surface charge density and ionic strength.

Main Results:

  • The NONE technique, combined with a susceptibility symmetry relation, enables absolute phase determination for interfacial potential calculation.
  • Simulations show the method's sensitivity to varying surface charge densities and ionic strengths.
  • Error analysis compares the linearized Poisson-Boltzmann approximation with NONE precision.

Conclusions:

  • The proposed NONE approach offers a promising route for phase-resolved SHG-based interfacial potential quantification.
  • This method requires only standard polarization optics added to existing SHG setups.
  • It simplifies the experimental determination of interfacial potentials compared to other phase-detection techniques.