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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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 the...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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 process,...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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 stretching vibration...

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Related Experiment Video

Updated: May 25, 2026

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Background-free nonlinear microspectroscopy with vibrational molecular interferometry.

Erik T Garbacik1, Jeroen P Korterik, Cees Otto

  • 1Optical Sciences Group, MESA+ Institute for Nanotechnology, University of Twente, 7500AE Enschede, The Netherlands.

Physical Review Letters
|January 17, 2012
PubMed
Summary
This summary is machine-generated.

We developed a new nonlinear microspectroscopy method for fast, high-resolution molecular imaging. This technique, vibrational molecular interferometry, clearly separates vibrational and electronic signals without background noise.

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Last Updated: May 25, 2026

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
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Published on: December 1, 2023

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Implementation of a Reference Interferometer for Nanodetection
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Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

  • Nonlinear Optics
  • Molecular Spectroscopy
  • Vibrational Spectroscopy

Background:

  • Nonlinear microspectroscopy techniques often struggle with complex signal contributions.
  • Distinguishing electronic and vibrational responses can be challenging.
  • Existing methods may suffer from nonresonant background noise.

Purpose of the Study:

  • To present a novel method for nonlinear microspectroscopy.
  • To provide an intuitive and unified description of signal contributions.
  • To enable direct extraction of vibrational responses and high-speed imaging.

Main Methods:

  • Utilizing three optical fields to create interfering Stokes Raman pathways.
  • Employing frequency modulation on one optical field.
  • Implementing a vibrational molecular interferometry technique.

Main Results:

  • Achieved direct extraction of the vibrational response.
  • Demonstrated high-speed imaging capabilities.
  • Successfully distinguished between electronic and vibrational signal contributions.
  • Eliminated nonresonant background noise.

Conclusions:

  • The developed vibrational molecular interferometry offers a powerful tool for nonlinear microspectroscopy.
  • This technique provides an intuitive framework for analyzing complex spectroscopic signals.
  • It enables high-speed, background-free molecular imaging with distinct electronic and vibrational information.