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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...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...

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Fabrication and Characterization of Superconducting Resonators
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Published on: May 21, 2016

Probing decoherence through Fano resonances.

Andreas Bärnthaler1, Stefan Rotter, Florian Libisch

  • 1Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna, Austria, EU.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Decoherence affects Fano resonances, with distinct trajectories observed for dissipation and dephasing. This research offers new ways to study decoherence in various physical systems using Fano resonances.

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Area of Science:

  • Quantum physics
  • Mesoscopic physics

Background:

  • Fano resonances appear in wave transmission through resonant structures.
  • Decoherence significantly influences quantum phenomena.

Purpose of the Study:

  • To investigate how decoherence impacts Fano resonances.
  • To differentiate between dissipation and unitary dephasing effects.

Main Methods:

  • Analyzing trajectories of the Fano asymmetry parameter (q) in the complex plane.
  • Comparing theoretical predictions with experimental data.

Main Results:

  • Decoherence strength dictates unique trajectories for the Fano asymmetry parameter.
  • Dissipation and unitary dephasing produce distinguishable trajectories.
  • Experimental validation using microwave cavities and quantum dot transport data.

Conclusions:

  • The study provides a novel method for characterizing decoherence processes.
  • Findings are applicable to diverse physical systems exhibiting Fano resonances.