Koecher, S. S.; Heydenreich, T.; Zhang, Y.; Reddy, G. N. M.; Caldarelli, S.; Yuan, H.; Glaser, S. J. published an article about the compound: 2,3-Dibromopropionic acid( cas:600-05-5,SMILESS:O=C(O)C(Br)CBr ).Name: 2,3-Dibromopropionic acid. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:600-05-5) through the article.
Here the authors study the optimum efficiency of the excitation of maximum quantum (MaxQ) coherence using anal. and numerical methods based on optimal control theory. The theor. limit of the achievable MaxQ amplitude and the min. time to achieve this limit are explored for a set of model systems consisting of up to five coupled spins. In addition to arbitrary pulse shapes, two simple pulse sequence families of practical interest are considered in the optimizations. Compared to conventional approaches, substantial gains were found both in terms of the achieved MaxQ amplitude and in pulse sequence durations. For a model system, theor. predicted gains of a factor of three compared to the conventional pulse sequence were exptl. demonstrated. Motivated by the numerical results, also two novel anal. transfer schemes were found: Compared to conventional approaches based on nonselective pulses and delays, double-quantum coherence in two-spin systems can be created twice as fast using isotropic mixing and hard spin-selective pulses. Also in a chain of three weakly coupled spins with the same coupling constants, triple-quantum coherence can be created in a time-optimal fashion using so-called geodesic pulses. (c) 2016 American Institute of Physics.
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