Research output: Contribution to journal › Article › peer-review
Characterizing Thermal Mixing Dynamic Nuclear Polarization via Cross-Talk between Spin Reservoirs. / Guarin, David; Marhabaie, Sina; Rosso, Alberto et al.
In: Journal of Physical Chemistry Letters, Vol. 8, No. 22, 16.11.2017, p. 5531-5536.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Characterizing Thermal Mixing Dynamic Nuclear Polarization via Cross-Talk between Spin Reservoirs
AU - Guarin, David
AU - Marhabaie, Sina
AU - Rosso, Alberto
AU - Abergel, Daniel
AU - Bodenhausen, Geoffrey
AU - Ivanov, Konstantin L.
AU - Kurzbach, Dennis
PY - 2017/11/16
Y1 - 2017/11/16
N2 - Dynamic nuclear polarization (DNP) embraces a family of methods to increase signal intensities in nuclear magnetic resonance (NMR) spectroscopy. Despite extensive theoretical work that allows one to distinguish at least five distinct mechanisms, it remains challenging to determine the relative weights of the processes that are responsible for DNP in state-of-the-art experiments operating with stable organic radicals like nitroxides at high magnetic fields and low temperatures. Specifically, determining experimental conditions where DNP involves thermal mixing, which denotes a spontaneous heat exchange between different spin reservoirs, remains challenging. We propose an experimental approach to ascertain the prevalence of the thermal mixing regime by monitoring characteristic signature properties of the time evolution of the hyperpolarization. We find that thermal mixing is the dominant DNP mechanism at high nitroxide radical concentrations, while a mixture of different mechanisms prevails at lower concentrations.
AB - Dynamic nuclear polarization (DNP) embraces a family of methods to increase signal intensities in nuclear magnetic resonance (NMR) spectroscopy. Despite extensive theoretical work that allows one to distinguish at least five distinct mechanisms, it remains challenging to determine the relative weights of the processes that are responsible for DNP in state-of-the-art experiments operating with stable organic radicals like nitroxides at high magnetic fields and low temperatures. Specifically, determining experimental conditions where DNP involves thermal mixing, which denotes a spontaneous heat exchange between different spin reservoirs, remains challenging. We propose an experimental approach to ascertain the prevalence of the thermal mixing regime by monitoring characteristic signature properties of the time evolution of the hyperpolarization. We find that thermal mixing is the dominant DNP mechanism at high nitroxide radical concentrations, while a mixture of different mechanisms prevails at lower concentrations.
UR - http://www.scopus.com/inward/record.url?scp=85034211190&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.7b02233
DO - 10.1021/acs.jpclett.7b02233
M3 - Article
C2 - 29076730
AN - SCOPUS:85034211190
VL - 8
SP - 5531
EP - 5536
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 22
ER -
ID: 9675166