@article {483,
	title = {Squid-Nmr Study of Methyl Quantum Tunneling in a Series of Carboxylic-Acids},
	journal = {Chemical Physics Letters},
	volume = {201},
	year = {1993},
	note = {Chem Phys LettKf754Times Cited:12Cited References Count:23},
	month = {Jan 8},
	pages = {550-554},
	abstract = {<p>Quantum tunneling frequencies of methyl groups at low temperature can be measured directly by low-field nuclear magnetic resonance (NMR) using our dc-SQUID (superconducting quantum interference device) spectrometer. From NMR spectra recorded in magnetic fields below 20 mT, tunneling frequencies between 140 and 250 kHz were measured for a homologous series of carboxylic acids at 4.2 K. For solids with equivalent crystal structures, we observe an exponential correlation between the tunneling frequency and the enthalpy of fusion; from this correlation we obtain information about the contribution of intermolecular interactions to the energy barrier for methyl rotation.</p>
},
	keywords = {nuclear},
	isbn = {0009-2614},
	doi = {Doi 10.1016/0009-2614(93)85115-5},
	url = {<Go to ISI>://WOS:A1993KF75400026},
	author = {Black, B. and Majer, G. and Pines, A.}
}
