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Related Concept Videos

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...
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,...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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.
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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,...

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In vivo Quantification of G Protein Coupled Receptor Interactions using Spectrally Resolved Two-photon Microscopy
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Optogalvanic double-resonance spectroscopy.

C R Vidal1

  • 1Max-Planck-Institut for Extraterrestrische Physik, 8046 Garching bei Mdinchen, West Germany.

Optics Letters
|August 21, 2009
PubMed
Summary
This summary is machine-generated.

Optogalvanic double-resonance spectroscopy offers a novel approach for state-selective analysis in plasmas. This technique is especially useful for observing molecular spectra, including vibrational progressions and collision-induced satellites.

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Area of Science:

  • Plasma Physics
  • Spectroscopy
  • Molecular Physics

Background:

  • State-selective spectroscopy is crucial for understanding plasma properties.
  • Existing methods may have limitations in resolving complex molecular spectra.

Purpose of the Study:

  • To introduce optogalvanic double-resonance spectroscopy as a new technique.
  • To highlight its utility for analyzing molecular spectra in plasmas.

Main Methods:

  • Utilizing optogalvanic double-resonance spectroscopy.
  • Applying the method to plasmas for spectral analysis.

Main Results:

  • Demonstrated the potential for state-selective spectroscopy.
  • Showcased the ability to observe individual vibrational progressions.
  • Enabled the observation of collision-induced satellites in molecular spectra.

Conclusions:

  • Optogalvanic double-resonance spectroscopy is a valuable new method for plasma analysis.
  • The technique is particularly suited for detailed molecular spectral investigations.