Related Experiment Video
Updated: Jun 21, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Improving 14N nuclear quadrupole resonance detection of trinitrotoluene using off-resonance effects
1Institute Jozef Stefan, Jamova 39, Ljubljana, Slovenia. alan.gregorovic@ijs.si
Abstract:
The off-resonance dependence of the amplitudes of the six dominant (14)N nuclear quadrupole resonance (NQR) lines in commercial polymorphic trinitrotoluene (TNT) sample were experimentally determined for a wide range of experimental parameters when irradiated with the spin-lock spin-echo (SLSE) pulse sequence. We find that the amplitudes off-resonance dependence follows a sinc-like function with an additional modulation due to the spacing between the RF pulses. This dependence can be very well modeled with expressions we have derived for a single site (14)N NQR in paranitrotoluene (PNT). The results can be immediately used for the reduction of the number of free parameters used in the robust signal processing models for the TNT NQR detectors.
More Related Videos
08:01Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
Published on: September 26, 2016
13:21Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
Published on: August 18, 2012
Related Concept Videos
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
NMR Spectrometers: Resolution and Error Correction
Nuclear Overhauser Enhancement (NOE)
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
Other Nuclides: 31P, 19F, 15N NMR
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)