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  4. Dynamic nuclear polarisation via the integrated solid effect II: experiments on naphthalene-h(8) doped with pentacene-d(14)
 
research article

Dynamic nuclear polarisation via the integrated solid effect II: experiments on naphthalene-h(8) doped with pentacene-d(14)

Eichhorn, T. R.  
•
Van Den Brandt, B.
•
Hautle, P.
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2014
Molecular Physics

In dynamic nuclear polarisation (DNP), also called hyperpolarisation, a small amount of unpaired electron spins is added to the sample containing the nuclear spins, and the polarisation of these unpaired electron spins is transferred to the nuclear spins by means of a microwave field. Traditional DNP polarises the electron spin of stable paramagnetic centres by cooling down to low temperature and applying a strong magnetic field. Then weak continuous wave microwave fields are used to induce the polarisation transfer. Complicated cryogenic equipment and strong magnets can be avoided using short-lived photo-excited triplet states that are strongly aligned in the optical excitation process. However, a much faster transfer of the electron spin polarisation is needed and pulsed DNP methods like nuclear orientation via electron spin locking (NOVEL) and the integrated solid effect (ISE) are used. To describe the polarisation transfer with the strong microwave fields in NOVEL and ISE, the usual perturbation methods cannot be used anymore. In the previous paper, we presented a theoretical approach to calculate the polarisation transfer in ISE. In the present paper, the theory is applied to the system naphthalene-h(8) doped with pentacene-d(14) yielding the photo-excited triplet states and compared with experimental results.

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Type
research article
DOI
10.1080/00268976.2013.863405
Web of Science ID

WOS:000338724000006

Author(s)
Eichhorn, T. R.  
Van Den Brandt, B.
Hautle, P.
Henstra, A.
Wenckebach, W. Th
Date Issued

2014

Publisher

Taylor & Francis

Published in
Molecular Physics
Volume

112

Issue

13

Start page

1773

End page

1782

Subjects

dynamic nuclear polarisation

•

hyperpolarisation

•

coherence transfer

•

photo-excited triplet states

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LIFMET  
Available on Infoscience
August 29, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/106148
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