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Related Concept Videos

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

2.3K
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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Mass Spectrum01:23

Mass Spectrum

3.5K
A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x axis represents the ratio of the mass of the charged fragment to the elementary charge it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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Related Experiment Video

Updated: Nov 21, 2025

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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Vibrational Sum-Frequency Generation Hyperspectral Microscopy for Molecular Self-Assembled Systems.

Haoyuan Wang1, Wei Xiong1,2

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA; email: haw002@ucsd.edu, w2xiong@ucsd.edu.

Annual Review of Physical Chemistry
|January 14, 2021
PubMed
Summary

Vibrational sum-frequency generation (VSFG) microscopy is a powerful hyperspectral imaging technique. It resolves complex material properties at surfaces and interfaces, advancing self-assembled material research.

Keywords:
hyperspectral imaginginterfacesmolecular self-assembled systemssurfacesvibrational sum-frequency generation

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Area of Science:

  • Spectroscopy and Microscopy
  • Materials Science
  • Biophysics

Background:

  • Vibrational sum-frequency generation (VSFG) microscopy is a nonlinear optical technique.
  • It excels at analyzing surfaces, interfaces, and non-centrosymmetric materials.
  • Traditional methods often lack the necessary spatial, temporal, and spectral resolution.

Purpose of the Study:

  • To review recent developments and applications of VSFG microscopy.
  • To elucidate the principles and methodologies of VSFG microscopy.
  • To highlight its utility in diverse scientific fields.

Main Methods:

  • Discussion of VSFG principles and hyperspectral imaging.
  • Comparison of wide-field and confocal point-scanning VSFG microscopy geometries.
  • Integration of VSFG with traditional spectroscopy, microscopy, and time-resolved measurements.

Main Results:

  • VSFG microscopy provides spectrally, spatially, and temporally resolved insights.
  • Demonstrated applications in self-assembled monolayers, plant cellulose, collagen, and biomimetic materials.
  • Reveals hidden relationships between physical properties in complex systems.

Conclusions:

  • VSFG microscopy is a versatile tool for characterizing interfacial and bulk properties.
  • Ultrafast transient VSFG microscopy enables measurement of ultrafast vibrational dynamics.
  • Future outlook suggests continued technical advancements and expanded scientific potential.