Chapter 9: Manipulating Singlet Order with Adiabatic Pulses

Результат исследования: Публикации в книгах, отчётах, сборниках, трудах конференцийглава/разделнаучнаярецензирование

Аннотация

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.

Язык оригиналаанглийский
Название основной публикацииIn-cell NMR Spectroscopy
Подзаголовок основной публикацииFrom Molecular Sciences to Cell Biology
РедакторыGiuseppe Pileio
ИздательRoyal Society of Chemistry
Страницы169-187
Число страниц19
Издание22
ISBN (электронное издание)9781788012171, 9781788015684
DOI
СостояниеОпубликовано - 2020

Серия публикаций

НазваниеNew Developments in NMR
Номер22
Том2020-January
ISSN (печатное издание)2044-253X
ISSN (электронное издание)2044-2548

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  • Цитировать

    Kiryutin, A. S., Rodin, B. A., Lukzen, N. N., Yurkovskaya, A. V., Vieth, H. M., & Ivanov, K. L. (2020). Chapter 9: Manipulating Singlet Order with Adiabatic Pulses. В G. Pileio (Ред.), In-cell NMR Spectroscopy: From Molecular Sciences to Cell Biology (22 ред., стр. 169-187). (New Developments in NMR; Том 2020-January, № 22). Royal Society of Chemistry. https://doi.org/10.1039/9781788019972-00169