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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...
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...
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.
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...
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...

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Related Experiment Video

Updated: Jul 8, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Total dephasing-rephasing balancing in Stark-pulse-modulated photon echoes.

F R Graf, B H Plagemann, A Renn

    Optics Letters
    |February 1, 1997
    PubMed
    Summary

    We discovered a new photon echo rephasing phenomenon in a Eu(3+) and Pr(3+) codoped crystal. This effect allows perfect dephasing-rephasing balance, enabling a new spectroscopic technique for Stark interactions.

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    Published on: January 28, 2019

    Area of Science:

    • Quantum Optics
    • Solid-State Spectroscopy
    • Laser Physics

    Background:

    • Photon echoes are coherent optical transients used to study light-matter interactions.
    • Stark pulses can perturb energy levels, influencing echo decay dynamics.
    • Rare-earth codoped crystals are important for optical applications.

    Purpose of the Study:

    • To investigate a novel rephasing phenomenon in a codoped crystal.
    • To explore the control of photon echo dynamics using Stark pulses.
    • To develop a new spectroscopic method for characterizing Stark interactions.

    Main Methods:

    • Utilizing Stark-pulse-modulated photon echoes.
    • Employing a Eu(3+)- and Pr(3+)-codoped Y(2)SiO(5) crystal.
    • Adjusting Stark pulse parameters during rephasing and dephasing periods.

    Main Results:

    • Observation of a novel rephasing phenomenon.
    • Achieving full recovery of the photon echo signal.
    • Demonstrating perfect dephasing-rephasing balancing of perturbations.

    Conclusions:

    • The observed phenomenon offers precise control over echo dynamics.
    • This effect can be used to distinguish between reversible and irreversible Stark interactions.
    • Proposes a new spectroscopic technique based on Stark pulse modulation.