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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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 Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. 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,...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Coherent multidimensional optical spectra measured using incoherent light.

Daniel B Turner1, Paul C Arpin, Scott D McClure

  • 1Department of Chemistry, Institute for Optical Sciences and Centre for Quantum Information and Quantum Control, University of Toronto, 80 Saint George Street, Toronto, Ontario, Canada, M5S 3H6.

Nature Communications
|August 30, 2013
PubMed
Summary
This summary is machine-generated.

Coherent two-dimensional electronic spectroscopy can now be performed using incoherent light, revealing molecular interactions and dynamics. This breakthrough offers new possibilities for spectral analysis, especially where femtosecond pulses are challenging to generate.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Molecular Dynamics

Background:

  • Four-wave mixing techniques provide insights into molecular interactions and dynamics beyond linear spectra.
  • Coherent multidimensional optical spectroscopy, a variant of four-wave mixing, maps correlations between absorption bands.
  • Traditionally, femtosecond pulses have been essential for high-resolution coherent multidimensional optical spectroscopy.

Purpose of the Study:

  • To demonstrate the feasibility of coherent two-dimensional electronic spectroscopy using incoherent light.
  • To explore the capabilities of incoherent light in resolving molecular spectral and dynamics information.
  • To investigate the potential for new experimental designs in spectral regions with limited femtosecond pulse availability.

Main Methods:

  • Implementation of coherent two-dimensional electronic spectroscopy using broadband spectrally incoherent light.
  • Measurement and analysis of spectra from model molecular systems.
  • Comparison of results obtained with incoherent light versus traditional femtosecond pulse methods.

Main Results:

  • Successful acquisition of coherent two-dimensional electronic spectra using incoherent light.
  • Observed similarities and differences between spectra generated by incoherent and femtosecond light.
  • Demonstrated particular sensitivity of incoherent light spectra to long-lived intermediates like photoisomers.

Conclusions:

  • Coherent two-dimensional electronic spectroscopy is achievable with incoherent light, expanding experimental accessibility.
  • Incoherent light spectroscopy offers unique insights into molecular dynamics, especially concerning photoisomers.
  • This approach paves the way for experiments in spectral ranges where femtosecond pulse generation is difficult.