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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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.
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Frequency-switched heterodyne cavity ringdown spectroscopy.

M D Levenson, B A Paldus, T G Spence

    Optics Letters
    |December 8, 2007
    PubMed
    Summary
    This summary is machine-generated.

    Sudden frequency shifts in cavity-coupled light create a beat signal. This optical heterodyne signal

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy

    Background:

    • Cavity-coupled light systems are fundamental in laser technology and optical sensing.
    • Measuring intracavity absorption is crucial for understanding material properties and light-matter interactions within optical cavities.

    Purpose of the Study:

    • To develop a novel method for measuring intracavity absorption spectra.
    • To achieve near quantum-limited sensitivity in absorption measurements.

    Main Methods:

    • Coupling light of a specific frequency into an optical cavity.
    • Suddenly shifting the input light frequency.
    • Detecting the radiation from the input port and its beat with the reflected frequency-shifted light.
    • Analyzing the time decay of the resulting optical heterodyne signal.

    Main Results:

    • A stable beat frequency is achievable when the input light frequency is shifted.
    • The time decay of the optical heterodyne signal provides a direct measure of intracavity absorption.
    • The method demonstrates near quantum-limited sensitivity.

    Conclusions:

    • Optical heterodyne signal analysis offers a sensitive technique for measuring intracavity absorption spectra.
    • This method advances the capabilities of spectroscopic measurements within optical cavities.