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Quantum Rotational Tunneling of Methyl Groups in Polymers

✍ Scribed by Colmenero, J.; Mukhopadhyay, R.; Alegría, A.; Frick, B.

Book ID
124171310
Publisher
The American Physical Society
Year
1998
Tongue
English
Weight
162 KB
Volume
80
Category
Article
ISSN
0031-9007

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Rotational frequencies of methyl group t
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Methyl tunnel frequencies, measured at 4 K, are found to be 455 +/- 8 kHz in methyl malonamide and 496 +/- 8 kHz in methyl ethyl ketone. The first is unaffected by deuteration of the amide groups. Measurements of the temperature dependence of the spin lattice relaxation time are also reported for me

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NMRRR elperunents, using field cyclin g, on pentamethylbenzene below 15 K yield one Zeeman-tunnel resonance anomaly in the spin-lattice relaxation, at 1.88 T, corresponding to a Larmor frequency equal to half the tunnel frequency, probably of methyl groups, whose reorientation causes the fi\* versus