Controlling Coherence Using the Internal Structure of Hard Pulses

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Yanqun Dong, R. G. Ramos, Dale Li, and S. E. Barrett
Department of Physics, Yale University, New Haven, Connecticut 06511, USA

Received 18 April 2008; published 19 June 2008

Thetiny difference between hard pulses and their delta-function approximationcan be exploited to control coherence. Variants on the magicecho that work despite a large spread in resonance offsetsare demonstrated using the zeroth- and first-order average Hamiltonian terms,for ¹³C NMR in ⁶⁰C. The ²⁹Si NMR linewidth ofsilicon has been reduced by a factor of about 70 000using this approach, which also has potential applications in magneticresonance microscopy and imaging of solids.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.100.247601
DOI:	10.1103/PhysRevLett.100.247601
PACS:	76.20.+q; 03.65.Yz; 76.60.Lz; 76.90.+d 76.20.+q General theory of magnetic resonances and relaxations 03.65.Yz Decoherence; open systems; quantum statistical methods 76.60.Lz Spin echoes (condensed matter NMR) 76.90.+d Other topics in magnetic resonances and relaxations YEAR: 2008

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