Evidence for Coherent Transfer of para-Hydrogen-Induced Polarization at Low Magnetic Fields

Evidence for Coherent Transfer of para-Hydrogen-Induced Polarization at Low Magnetic Fields Научная публикация

Журнал

The Journal of Physical Chemistry Letters
ISSN: 1948-7185

Вых. Данные

Год: 2013, Том: 4, Номер: 15, Страницы: 2514-2519 Страниц : 6 DOI: 10.1021/jz401210m

Ключевые слова

spin hyperpolarization, PHIP, spin coherences, level anticrossings, polarization transfer

Авторы

Kiryutin Alexey S. ^1,2 , Yurkovskaya Alexandra V. ^1,2 , Kaptein Robert ^2,3 , Vieth Hans-Martin ⁴ , Ivanov Konstantin L. ^1,2

Организации

1	International Tomography Center SB RAS, Novosibirsk 630090, Russia
2	Novosibirsk State University, Novosibirsk 630090, Russia
3	Utrecht University, NL-3584 CH Utrecht, The Netherlands
4	Freie Universität Berlin, Berlin D-14195, Germany

We have investigated the mechanism of para-hydrogen-induced polarization (PHIP) transfer from the original strongly aligned protons to other nuclei at low external magnetic fields. Although it is known that PHIP is efficiently transferred at low fields, the nature of the transfer mechanism, that is, coherent spin mixing or cross-relaxation, is not well established. Polarization transfer kinetics for individual protons of styrene was, for the first time, measured and modeled theoretically. Pronounced oscillations were observed indicating a coherent transfer mechanism. Spin coherences were excited by passing through an avoided level crossing of the nuclear spin energy levels. Transfer at avoided level crossings is selective with respect to spin order. Our work provides evidence that the coherent PHIP transfer mechanism is dominant at low magnetic fields.

Kiryutin A.S. , Yurkovskaya A.V. , Kaptein R. , Vieth H-M. , Ivanov K.L.
Evidence for Coherent Transfer of para-Hydrogen-Induced Polarization at Low Magnetic Fields
The Journal of Physical Chemistry Letters. 2013. V.4. N15. P.2514-2519. DOI: 10.1021/jz401210m WOS OpenAlex

Поступила в редакцию:	11 июн. 2013 г.
Принята к публикации:	16 июл. 2013 г.
Опубликована online:	19 июл. 2013 г.
Опубликована в печати:	1 авг. 2013 г.

Web of science:	WOS:000322807600018
OpenAlex:	W2094119450

БД	Цитирований
OpenAlex	23