## Optimising broadband pulses for DEER depends on concentration and distance range of interest

2020
772027
Journal article
Published
##### Published in
Magnetic Resonance ; 1 (2020), 1. - pp. 59-74. - Copernicus Publications. - eISSN 2699-0016
##### Abstract
EPR distance determination in the nanometre region has become an important tool for studying the structure and interaction of macromolecules. Arbitrary waveform generators (AWGs), which have recently become commercially available for EPR spectrometers, have the potential to increase the sensitivity of the most common technique, double electron–electron resonance (DEER, also called PELDOR), as they allow the generation of broadband pulses. There are several families of broadband pulses, which are different in general pulse shape and the parameters that define them. Here, we compare the most common broadband pulses. When broadband pulses lead to a larger modulation depth, they also increase the background decay of the DEER trace. Depending on the dipolar evolution time, this can significantly increase the noise level towards the end of the form factor and limit the potential increase in the modulation-to-noise ratio (MNR). We found asymmetric hyperbolic secant (HS{1,6}) pulses to perform best for short DEER traces, leading to a MNR improvement of up to 86 % compared to rectangular pulses. For longer traces we found symmetric hyperbolic secant (HS{1,1}) pulses to perform best; however, the increase compared to rectangular pulses goes down to 43 %.
540 Chemistry
##### Cite This
ISO 690SCHERER, Andreas, Sonja TISCHLIK, Sabrina WEICKERT, Valentin WITTMANN, Malte DRESCHER, 2020. Optimising broadband pulses for DEER depends on concentration and distance range of interest. In: Magnetic Resonance. Copernicus Publications. 1(1), pp. 59-74. eISSN 2699-0016. Available under: doi: 10.5194/mr-1-59-2020
BibTex
@article{Scherer2020-05-12Optim-51049,
year={2020},
doi={10.5194/mr-1-59-2020},
title={Optimising broadband pulses for DEER depends on concentration and distance range of interest},
number={1},
volume={1},
journal={Magnetic Resonance},
pages={59--74},
author={Scherer, Andreas and Tischlik, Sonja and Weickert, Sabrina and Wittmann, Valentin and Drescher, Malte}
}

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<dcterms:abstract xml:lang="eng">EPR distance determination in the nanometre region has become an important tool for studying the structure and interaction of macromolecules. Arbitrary waveform generators (AWGs), which have recently become commercially available for EPR spectrometers, have the potential to increase the sensitivity of the most common technique, double electron–electron resonance (DEER, also called PELDOR), as they allow the generation of broadband pulses. There are several families of broadband pulses, which are different in general pulse shape and the parameters that define them. Here, we compare the most common broadband pulses. When broadband pulses lead to a larger modulation depth, they also increase the background decay of the DEER trace. Depending on the dipolar evolution time, this can significantly increase the noise level towards the end of the form factor and limit the potential increase in the modulation-to-noise ratio (MNR). We found asymmetric hyperbolic secant (HS{1,6}) pulses to perform best for short DEER traces, leading to a MNR improvement of up to 86 % compared to rectangular pulses. For longer traces we found symmetric hyperbolic secant (HS{1,1}) pulses to perform best; however, the increase compared to rectangular pulses goes down to 43 %.</dcterms:abstract>
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