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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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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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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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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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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.
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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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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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Related Experiment Video

Updated: May 4, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

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Characterization of starch polymorphic structures using vibrational sum frequency generation spectroscopy.

Lingyan Kong1, Christopher Lee, Seong H Kim

  • 1Department of Food Science, Pennsylvania State University , University Park, Pennsylvania 16802, United States.

The Journal of Physical Chemistry. B
|January 18, 2014
PubMed
Summary
This summary is machine-generated.

Vibrational sum frequency generation (SFG) spectroscopy differentiates starch polymorphs by detecting ordered domains. SFG spectroscopy reveals distinct structural differences between A-, B-, and V-type starches and cyclodextrins based on molecular packing.

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Analysis and Specification of Starch Granule Size Distributions
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Analysis and Specification of Starch Granule Size Distributions
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Analysis and Specification of Starch Granule Size Distributions

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Area of Science:

  • Carbohydrate chemistry
  • Spectroscopy
  • Materials science

Background:

  • Starch exists in various polymorphic forms (A, B, V) with distinct crystalline structures.
  • Understanding these structures is crucial for controlling starch properties in food and materials science.
  • Vibrational sum frequency generation (SFG) spectroscopy is a surface-sensitive technique capable of probing molecular order.

Purpose of the Study:

  • To characterize the polymorphic structures of starch using SFG spectroscopy.
  • To differentiate between crystalline polymorphs based on their molecular arrangements.
  • To compare starch structures with cyclodextrin inclusion complexes.

Main Methods:

  • Vibrational sum frequency generation (SFG) spectroscopy was employed.
  • Analysis focused on the noncentrosymmetric ordered domains within starch polymorphs.
  • Spectral data were compared between V-type amylose, A-type starch, B-type starch, and cyclodextrin inclusion complexes.

Main Results:

  • V-type amylose was SFG-inactive due to antiparallel helix packing.
  • A- and B-type starches exhibited distinct SFG peaks corresponding to CH and CH2 stretching.
  • Significant differences in CH2/CH intensity ratios indicated varied hydroxymethyl group conformations in A- and B-type starches.
  • Cyclodextrins showed SFG signals dependent on stacking patterns, with signal annihilation when dipoles opposed.

Conclusions:

  • SFG spectroscopy effectively distinguishes starch polymorphs and ordered structures.
  • Molecular packing and functional group orientation dictate SFG activity and spectral features.
  • The study provides insights into the structural basis of starch polymorphism and cyclodextrin complexation.