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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

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Related Experiment Video

Updated: May 28, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
09:57

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Time-resolved resonance Raman spectroscopy: exploring reactive intermediates.

Sangram Keshari Sahoo1, Siva Umapathy, Anthony W Parker

  • 1Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore-560012, India.

Applied Spectroscopy
|October 12, 2011
PubMed
Summary
This summary is machine-generated.

Time-resolved Raman spectroscopy captures fleeting chemical intermediates, offering detailed insights into reaction mechanisms. This technique provides molecular snapshots from picoseconds to microseconds, advancing chemical dynamics studies.

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Last Updated: May 28, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
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Area of Science:

  • Chemical Kinetics and Dynamics
  • Spectroscopic Techniques
  • Computational Chemistry

Background:

  • Understanding reaction mechanisms requires observing transient chemical species.
  • Diverse intermediates and timescales necessitate specialized analytical methods.
  • Advances in spectroscopy and computation aid in visualizing reactive intermediates.

Purpose of the Study:

  • To review the chronological development of time-resolved Raman spectroscopy.
  • To highlight the challenges and solutions in obtaining high-quality spectra of intermediates.
  • To demonstrate the technique's utility in studying chemical dynamics.

Main Methods:

  • Time-resolved Raman spectroscopy
  • Resonance Raman spectroscopy
  • Pulsed tunable lasers
  • High-speed multichannel detectors

Main Results:

  • Raman spectroscopy provides detailed molecular structure and dynamics of short-lived intermediates.
  • Simultaneous advances in spectroscopy and computational methods enable visualization of intermediates.
  • Techniques have been developed to obtain background-free, intense, and spectrally resolved Raman spectra.

Conclusions:

  • Time-resolved Raman spectroscopy is a mature and advantageous technique for studying reaction intermediates.
  • The development of this technique has paved the way for novel spectroscopic methods.
  • It offers superior insights compared to time-resolved absorption and emission spectroscopy.