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Related Concept Videos

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Related Experiment Video

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Measuring electric fields and noncovalent interactions using the vibrational stark effect.

Stephen D Fried1, Steven G Boxer1

  • 1Department of Chemistry; Stanford University, Stanford, California 94305-5080, United States.

Accounts of Chemical Research
|March 24, 2015
PubMed
Summary
This summary is machine-generated.

We developed a spectroscopic method using the vibrational Stark effect (VSE) to measure electric fields within matter. This technique maps vibrational frequencies to electric fields, aiding the study of biomolecular interactions and noncovalent forces.

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Area of Science:

  • Spectroscopy
  • Physical Chemistry
  • Biophysics

Background:

  • The vibrational Stark effect (VSE) is a phenomenon linking vibrational frequencies to local electric fields.
  • Understanding electric fields within matter is crucial for various scientific disciplines.
  • Previous methods lacked the resolution to precisely map these fields.

Purpose of the Study:

  • To present a spectroscopic approach for measuring electric fields inside matter with high spatial and field resolution.
  • To explain the vibrational Stark effect (VSE) methodology and its applications.
  • To provide a framework for quantitative modeling of intermolecular interactions.

Main Methods:

  • Utilizing the vibrational Stark effect (VSE) to correlate vibrational probe frequencies with local electric fields.
  • Designing and implementing intrinsic and extrinsic vibrational probes.
  • Employing modern spectroscopic instruments for high-resolution frequency measurements.

Main Results:

  • Achieved high spatial (<1 Å) and field (<1 MV/cm) resolution in electric field measurements.
  • Successfully applied VSE to study biomolecular phenomena like drug-receptor interactions and enzyme catalysis.
  • Established VSE as a method for quantitative modeling of noncovalent interactions.

Conclusions:

  • The VSE spectroscopic approach offers a powerful tool for mapping electric fields in diverse environments.
  • This method provides quantitative insights into intermolecular forces and can guide molecular design.
  • VSE enhances the understanding of complex biomolecular systems and chemical processes.