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 Full article

Journal

The Journal of Physical Chemistry Letters
ISSN: 1948-7185

Output data

Year: 2013, Volume: 4, Number: 15, Pages: 2514-2519 Pages count : 6 DOI: 10.1021/jz401210m

Tags

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

Authors

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

Affiliations

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

Submitted:	Jun 11, 2013
Accepted:	Jul 16, 2013
Published online:	Jul 19, 2013
Published print:	Aug 1, 2013

Web of science:	WOS:000322807600018
OpenAlex:	W2094119450

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