Study of molecular reorientation and quantum rotational tunneling in tetramethylammonium selenate by H-1 NMR

Mallikarjunaiah, KJ and Paramita, KC and Ramesh, KP and Damle, R (2007) Study of molecular reorientation and quantum rotational tunneling in tetramethylammonium selenate by H-1 NMR. In: Solid State Nuclear Magnetic Resonance, 32 (1). pp. 11-15.

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Abstract

H-1 NMR spin-lattice relaxation time measurements have been carried out in [(CH3)(4)N](2)SeO4 in the temperature range 389-6.6K to understand the possible phase transitions, internal motions and quantum rotational tunneling. A broad T, minimum observed around 280K is attributed to the simultaneous motions of CH3 and (CH3)(4)N groups. Magnetization recovery is found to be stretched exponential below 72 K with varying stretched exponent. Low-temperature T-1 behavior is interpreted in terms of methyl groups undergoing quantum rotational tunneling. (c) 2007 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	Solid State Nuclear Magnetic Resonance
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	H NMR;Internal motions;Magnetization recovery;Spin–lattice relaxation time;Quantum rotational tunneling.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	11 Jun 2010 09:17
Last Modified:	19 Sep 2010 06:01
URI:	http://eprints.iisc.ac.in/id/eprint/27495

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