Dynamic polarization of ZF in a fluorinated alcohol Page: 1 of 8
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Th. submitted manuscript M.. be.n .uthorat O ANL-HEP-CP-88-72
by a coG"tracto' of the U.S. Goernment For the Proceedings of the
under contract No.. W-31-IOQ-ENG*38.Sy p s u
Accordingly, the U, S. GoVer nent retains 8th International Symposium
nonaxcl..,iv. royalty free licns to publish
.T"2,m o"ZEon High Energy Spin Physics
or reproduce te published form of thison H g E ery S i Ph sc
contribution, om allow others to do so. for i n a o isti n s t
U. *'"'* "'*-n* Minneapolis, Minnesota
12-17 September 1988
DYNAMIC POLARIZATION OF 19F IN A FLUORINATED ALCOHOLt
D. Hill and T. Kasprzyk 1
Argonne National Laboratory, Argonne, IL 60439
J. J. Jarmer and S. Penttila Aar
Los Alamos National Laboratory, Los Alamos, NM 87545
M. Krumpolc
University of Illinois at Chicago, Chicago, IL 60680
G. W. Hoffmann and M. Purcell ANL-HEP-CP--88-72
University of Texas, Austin, TX 78712
DE89 005854
ABSTRACT
We have studied microwave dynamic cooling of 19F and lH nuclei
in mixtures of 1,1,1,3,3,3-hexafluoro-2-propanol and water, doped
with Cr(V) complex. Equal spin temperatures of the two nuclei are
produced, and the highest spin polarizations (- 80%) are found in
mixtures near the eutectic ratio. The high fluorine content and
polarization make this a suitable material for polarized nuclear
scattering experiments.
INTRODUCTION
We recently reportedly the first results of a program to expand
the list of nuclei with a proven capability to serve as polarized
targets, in a form suitable for intermediate energy scattering
experiments. We reported useful levels of 13C-polarization in solid
samples of 99 at.%-enriched ethylene-1,2-13C2 glycol, polarized by
means of microwave dynamic nuclear polarization (DNP). The first
use of this material in a polarized scattering experiment was
recently completed.2 We now report sizeable polarizations of 19F
nuclei obtained by DNP in a fluorine-rich solid which can be readily
prepared.
Substantial spin polarization of 19F has been attained long
ago3,4 in some ionic solids such as CaF2 and LiF. However, the
attractiveness of these crystalline materials as polarized targets
is impaired by the relative difficulty of the doping processes by
which paramagnetic centers are introduced into the solid. For prac-
tical purposes it would be preferable to be able to use the simpler
method of doping commonly applied in the case of many polarized
proton target materials, namely, dissolving a Cr(V)-complex in the
liquid phase of the material and then rapidly freezing the mixture
to form a solid solution. For this we require a material having the
following properties: a) It should be as rich as possible in the
nuclear species of interest, in this case fluorine. b) It should be
a liquid at temperatures not too far from room temperature. c) It
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Hill, D.; Kasprzyk, T.; Jarmer, J. J.; Penttilae, S.; Krumpolc, M.; Hoffmann, G. W. et al. Dynamic polarization of ZF in a fluorinated alcohol, article, January 1, 1988; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1209402/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.