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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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.

Double Resonance Techniques: Overview

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...

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Published on: July 12, 2017

Single isolated attosecond pulse from multicycle lasers.

Carlo Altucci¹, Rosario Esposito, Valer Tosa

¹CNISM--Dipartimento di Scienze Fisiche, Universita di Napoli Federico II, Napoli, Italy.

|December 17, 2008

Summary

Researchers developed a new experimental method for generating attosecond pulses using high harmonic generation. This robust technique is effective for laser pulses up to 25 femtoseconds.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Area of Science:

Quantum optics
Ultrafast science

Background:

Generating ultrashort light pulses is crucial for studying ultrafast phenomena.
Existing methods for attosecond pulse generation face challenges in terms of complexity and robustness.

Purpose of the Study:

To propose a novel and practical experimental scheme for producing clean, isolated attosecond pulses.
To enhance the efficiency and stability of attosecond pulse generation.

Main Methods:

Utilizing high harmonic generation (HHG) as the core mechanism.
Implementing polarization gating combined with ionization dynamics.
Employing spatial filtering through three-dimensional field propagation.

Main Results:

The proposed scheme successfully generates isolated attosecond pulses.
The method demonstrates robustness against fluctuations in laser parameters.
Effectiveness is shown for laser pulse durations up to 25 femtoseconds (fs).

Conclusions:

The new experimental scheme offers a simplified and reliable approach to attosecond pulse production.
This method has the potential to advance attosecond science and its applications.