Proton Spin-Lattice Relaxation from Classical and Tunneling Rotation of Methyl Groups in Thioacetamide

Autor:	Ryozo Yoshizaki, Satoru Watanabe, Yoshihito Abe
Rok vydání:	1985
Předmět:	Larmor precession Physics General Physics and Astronomy Molecular physics Classical limit chemistry.chemical_compound chemistry Lattice (order) Quantum mechanics Proton spin crisis Molecule Thioacetamide Maxima Quantum tunnelling
Zdroj:	Journal of the Physical Society of Japan. 54:41-44
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.54.41
Popis:	The proton spin-lattice relaxation rate 1/ T 1 in solid thioacetamide were measured between 28.5 K and 200 K at two Larmor frequencies, 11.4 MHz and 25 MHz. The temperature dependence of 1/ T 1 was characterized by three maxima, two maxima observed around 90 K and 37 K showing the frequency dependence and the frequency independent one at 44 K. Taking into account two crystal-lographically inequivalent thioacetamide molecules, the temperature and Larmor frequency dependence of 1/ T 1 was explained by the contribution from the quantum mechanical and classical limit of tunneling rotation of the methyl groups around their C 3 axes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d6fccfd961398af29980a2f84ad3230e https://doi.org/10.1143/jpsj.54.41 Zobrazit plný text záznamu