Improved ultra-broadband chirp excitation

Mohammadali Foroozandeh; Mathias Nilsson; Gareth A Morris

doi:10.1016/j.jmr.2019.03.007

Improved ultra-broadband chirp excitation

J Magn Reson. 2019 May:302:28-33. doi: 10.1016/j.jmr.2019.03.007. Epub 2019 Mar 26.

Authors

Mohammadali Foroozandeh¹, Mathias Nilsson², Gareth A Morris²

Affiliations

¹ Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK. Electronic address: mohammadali.foroozandeh@chem.ox.ac.uk.
² School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.

PMID: 30939336
DOI: 10.1016/j.jmr.2019.03.007

Abstract

The design and application of ultra-broadband excitation pulses have been among the most interesting and timely areas in NMR and EPR methodology in recent years, due especially to advances in hardware design in EPR, the advent and popularity of high- and ultrahigh-field NMR, and the application of numerical methods like optimal control theory to the design and optimization of radiofrequency pulses and pulse sequences. In this communication, we present a short, robust, and flexible version of the CHORUS family of constant-phase, very broadband excitation sequences. We demonstrate that more than 0.5 MHz excitation with uniform amplitudes and phases can be achieved with this excitation sequence.

Keywords: CHORUS; Chirp excitation; Chirp pulses; Ultra-broadband excitation.