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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...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...

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Updated: Jun 19, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

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Published on: December 3, 2013

Optical dephasing mechanisms in Tm(3+):Y(2)Si(2)O(7).

G M Wang, R W Equall, R L Cone

    Optics Letters
    |October 31, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Optical dephasing in Tm(3+):Y2Si2O7 was measured using photon echoes. This study highlights its potential for advanced data storage and signal processing applications due to its unique optical properties.

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    Last Updated: Jun 19, 2026

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    Area of Science:

    • Solid-state spectroscopy
    • Quantum optics
    • Materials science

    Background:

    • Thulium-doped materials are investigated for optical applications.
    • Understanding optical dephasing is crucial for developing new technologies.

    Purpose of the Study:

    • To measure optical dephasing in Tm(3+):Y2Si2O7.
    • To evaluate its suitability for time-domain signal processing and data storage.

    Main Methods:

    • Photon echo measurements were performed.
    • Optical dephasing was studied as a function of temperature and laser excitation intensity.

    Main Results:

    • A coherence time of T(2) = 23 micros was measured at 1.24 K for the (3)H(6)(1) ? (3)H(4)(1) transition.
    • A homogeneous linewidth of 14 kHz and an inhomogeneous linewidth of 100 GHz were determined.
    • An inhomogeneous-to-homogeneous linewidth ratio of 7 x 10(6) was calculated.

    Conclusions:

    • Tm(3+):Y2Si2O7 exhibits favorable optical properties for advanced applications.
    • The material's large linewidth ratio and suitable transition wavelength make it a promising candidate for time-domain signal processing.
    • Its properties suggest potential for transient optically addressed data storage.