ESR Study of Quantum Tunneling of a Methyl Group: A Simple Tunneling Model

Autor:	Ichiro Miyagawa, R. B. Davidson
Rok vydání:	1970
Předmět:	SIMPLE (dark matter experiment) Condensed matter physics Proton Chemistry General Physics and Astronomy Molecular physics chemistry.chemical_compound Physics::Chemical Physics Physical and Theoretical Chemistry Absorption (chemistry) Twist Anisotropy Quantum tunnelling Methyl group
Zdroj:	The Journal of Chemical Physics. 52:1727-1732
ISSN:	1089-7690 0021-9606
Popis:	The ESR absorption of the intermediate radical CH3⋅CHR from l‐alanine was studied at 4.2°K. It was found that the methyl group spectrum for the a axis was different than that for the c axis. While Freed's theory J. Chem. Phys. 43, 1710 (1965)] failed to explain this fact, a simple quantum‐tunneling model was found to account for the observations satisfactorily, attributing the observed difference to an anisotropic dipole–dipole interaction. It was shown that an hfs splitting having any functional dependence on the angle of twist Θ results in the characteristic splitting of the E states. A methyl proton which has the cos2Θ dependence assumed by Freed was found to be a special case exhibiting this E state splitting.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5e02d5508677708ea3de16d85de7971a https://doi.org/10.1063/1.1673211 Zobrazit plný text záznamu