Adiabatic Solid Effect
Name
nihms-1713977.pdf
Description
Accepted version
Size
1.1 MB
Format
Unknown
Checksum (MD5)
f07576a9ae45a79c9ad41e212614d647
Author(s)
Tan, Kong Ooi
Weber, Ralph T.
Can, Thach V.
Griffin, Robert G.
Date Issued
April 2020
Journal
Journal of Physical Chemistry Letters
Publisher
American Chemical Society (ACS)
Citation
Tan, Kong Ooi, Weber, Ralph T, Can, Thach V and Griffin, Robert G. 2020. "Adiabatic Solid Effect." Journal of Physical Chemistry Letters, 11 (9).
Version
Author's final manuscript
Abstract
The solid effect (SE) is a two spin dynamic nuclear polarization (DNP) mechanism that enhances the sensitivity in NMR experiments by irradiation of the electron-nuclear spin transitions with continuous wave (CW) microwaves at ω0S ± ω0I, where ω0S and ω0I are electron and nuclear Larmor frequencies, respectively. Using trityl (OX063), dispersed in a 60/40 glycerol/water mixture at 80 K, as a polarizing agent, we show here that application of a chirped microwave pulse, with a bandwidth comparable to the EPR line width applied at the SE matching condition, improves the enhancement by a factor of 2.4 over the CW method. Furthermore, the chirped pulse yields an enhancement that is ∼20% larger than obtained with the ramped-amplitude NOVEL (RA-NOVEL), which to date has achieved the largest enhancements in time domain DNP experiments. Numerical simulations suggest that the spins follow an adiabatic trajectory during the polarization transfer; hence, we denote this sequence as an adiabatic solid effect (ASE). We foresee that ASE will be a practical pulsed DNP experiment to be implemented at higher static magnetic fields due to the moderate power requirement. In particular, the ASE uses only 13% of the maximum microwave power required for RA-NOVEL.
MIT Department
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Massachusetts Institute of Technology. Department of Chemistry
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1021/acs.jpclett.0c00654
