Direct measurement of the triple spin flip rate in dynamic nuclear polarization

W. Th Wenckebach; A. Capozzi; S. Patel; J. H. Ardenkjær-Larsen

doi:10.1016/j.jmr.2021.106982

Direct measurement of the triple spin flip rate in dynamic nuclear polarization

W. Th Wenckebach^*, A. Capozzi, S. Patel, J. H. Ardenkjær-Larsen

^*Corresponding author for this work

Paul Scherrer Institute

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

A previous study of the effect of Gadolinium doping on the dynamic polarization (DNP) of ¹³C using trityls showed that the rate at which the polarization builds up is almost independent of the Gadolinium concentration, while the electron spin–lattice relaxation rate varies over an order of magnitude. In this paper we analyze the polarization build-up in detail and show that in this case DNP is due to the cross-effect (CE) and that the build-up rate can be quantitatively interpreted as the rate of the triple spin flips responsible for the CE. Thus this build-up rate presents a direct measurement of this triple spin flip rate.

Original language	English
Article number	106982
Journal	Journal of Magnetic Resonance
Volume	327
Number of pages	8
ISSN	1090-7807
DOIs	https://doi.org/10.1016/j.jmr.2021.106982
Publication status	Published - 2021

Bibliographical note

Funding Information:
The research leading to these results has received funding from the Danish National Research Foundation (DNRF124), the Swiss National Fund under the SPARK grant agreement No. CRSK-2_190547 and Ambizione grant agreement No. PZ00P2_193276 and the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 713683 (COFUNDfellowsDTU).

Keywords

Cross effect
Dynamic nuclear polarization
Hyperpolarization
Thermal mixing
Triple spin flip rate

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title = "Direct measurement of the triple spin flip rate in dynamic nuclear polarization",

abstract = "A previous study of the effect of Gadolinium doping on the dynamic polarization (DNP) of 13C using trityls showed that the rate at which the polarization builds up is almost independent of the Gadolinium concentration, while the electron spin–lattice relaxation rate varies over an order of magnitude. In this paper we analyze the polarization build-up in detail and show that in this case DNP is due to the cross-effect (CE) and that the build-up rate can be quantitatively interpreted as the rate of the triple spin flips responsible for the CE. Thus this build-up rate presents a direct measurement of this triple spin flip rate.",

keywords = "Cross effect, Dynamic nuclear polarization, Hyperpolarization, Thermal mixing, Triple spin flip rate",

author = "Wenckebach, {W. Th} and A. Capozzi and S. Patel and Ardenkj{\ae}r-Larsen, {J. H.}",

note = "Funding Information: The research leading to these results has received funding from the Danish National Research Foundation (DNRF124), the Swiss National Fund under the SPARK grant agreement No. CRSK-2_190547 and Ambizione grant agreement No. PZ00P2_193276 and the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 713683 (COFUNDfellowsDTU). ",

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T1 - Direct measurement of the triple spin flip rate in dynamic nuclear polarization

AU - Wenckebach, W. Th

AU - Capozzi, A.

AU - Patel, S.

AU - Ardenkjær-Larsen, J. H.

N1 - Funding Information: The research leading to these results has received funding from the Danish National Research Foundation (DNRF124), the Swiss National Fund under the SPARK grant agreement No. CRSK-2_190547 and Ambizione grant agreement No. PZ00P2_193276 and the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 713683 (COFUNDfellowsDTU).

PY - 2021

Y1 - 2021

N2 - A previous study of the effect of Gadolinium doping on the dynamic polarization (DNP) of 13C using trityls showed that the rate at which the polarization builds up is almost independent of the Gadolinium concentration, while the electron spin–lattice relaxation rate varies over an order of magnitude. In this paper we analyze the polarization build-up in detail and show that in this case DNP is due to the cross-effect (CE) and that the build-up rate can be quantitatively interpreted as the rate of the triple spin flips responsible for the CE. Thus this build-up rate presents a direct measurement of this triple spin flip rate.

AB - A previous study of the effect of Gadolinium doping on the dynamic polarization (DNP) of 13C using trityls showed that the rate at which the polarization builds up is almost independent of the Gadolinium concentration, while the electron spin–lattice relaxation rate varies over an order of magnitude. In this paper we analyze the polarization build-up in detail and show that in this case DNP is due to the cross-effect (CE) and that the build-up rate can be quantitatively interpreted as the rate of the triple spin flips responsible for the CE. Thus this build-up rate presents a direct measurement of this triple spin flip rate.

KW - Cross effect

KW - Dynamic nuclear polarization

KW - Hyperpolarization

KW - Thermal mixing

KW - Triple spin flip rate

U2 - 10.1016/j.jmr.2021.106982

DO - 10.1016/j.jmr.2021.106982

M3 - Journal article

C2 - 33932911

AN - SCOPUS:85105696919

SN - 1090-7807

VL - 327

JO - Journal of Magnetic Resonance

JF - Journal of Magnetic Resonance

M1 - 106982

ER -

Direct measurement of the triple spin flip rate in dynamic nuclear polarization

Abstract

Bibliographical note

Keywords

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