Chapter 9: Manipulating Singlet Order with Adiabatic Pulses

Chapter 9: Manipulating Singlet Order with Adiabatic Pulses Full article

Source

New Developments in NMR No. 22 Long-lived Nuclear Spin Order: Theory and Applications
Monography, The Royal Society of Chemistry. United Kingdom by CPI Group (UK) Ltd, Croydon, CR0 4YY, UK.2020. 442 c. ISBN 978-1-78801-568-4.

Output data

Year: 2020, Pages: 169 - 187 Pages count : 19 DOI: 10.1039/9781788019972-00169

Authors

Kiryutin A.S. ^1,2 , Rodin B.A. ^1,2 , Lukzen N.N. ^1,2 , Yurkovskaya A.V. ^1,2 , Vieth H.-M. ^1,3 , Ivanov K.L. ^1,2

Affiliations

1	International Tomography Center, Siberian Branch of the Russian Academy of Science, Institutskaya 3a, Novosibirsk 630090, Russia
2	Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia
3	Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimallee 14, 14195 Berlin, Germany

A family of methods is introduced for creating, manipulating and observing nuclear singlet spin order. The basic element is conversion between longitudinal magnetisation and singlet spin order, M2S and S2M. It is based on near-resonance radio-frequency pulses of adiabatically varying amplitude that guide the spins through regions of avoided level-crossings of the system. After discussing the theoretical concepts, we illustrate the practical application of such Adiabatic Passage Spin Order Conversion (APSOC) by analysing the relaxation decay of singlet order independent of the coupling strength of the spin pair. By combining several such pulse sequences and varying their carrier frequency, a filter is designed for Singlet Order Selection (SOS) and suppression of all other spectral components. It enables background-free detection of selected spin pairs. To ease the constraint of slow amplitude variation while staying within the limits of adiabaticity the pulse amplitude profile is shaped so that only near level-crossings speed is reduced, but increased elsewhere; optimum control methods are used to find the ideal pulse shape. In this way adverse relaxation effects during pulses are minimised. Conversion factors close to the theoretical maximum are thus achievable. With such a toolbox not only highly efficient conversion is possible, but also other manipulations of spin order, e.g. polarisation transfer between different spin species or anti-phase to in-phase transformation of spectral components.

Kiryutin A.S. , Rodin B.A. , Lukzen N.N. , Yurkovskaya A.V. , Vieth H.-M. , Ivanov K.L.
Chapter 9: Manipulating Singlet Order with Adiabatic Pulses
Monography chapter New Developments in NMR No. 22 Long-lived Nuclear Spin Order: Theory and Applications. – The Royal Society of Chemistry., 2020. – C.169 - 187. – ISBN 978-1-78801-568-4. DOI: 10.1039/9781788019972-00169 OpenAlex

Published online:	Apr 7, 2020
Published print:	Apr 15, 2020

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