Analysis of collective modes in some AMXN systems

Chandrakumar, N. ; Visalakshi, G. V. ; Ramaswamy, D. ; Subramanian, S. (1986) Analysis of collective modes in some AMXN systems Journal of Magnetic Resonance, 67 (2). pp. 307-318. ISSN 1090-7807

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The behavior of spin½ AX3 and A2X2 systems evolving under cross-polarization (CP) and isotropic mixing (IM) is analyzed in detail by computing the time development of the density operator by commutator algebra. The two mixing processes are compared in these cases with respect to their coherence-transfer frequencies, efficiency, and the resulting multiplet patterns. The effect of two types of purge on the density operator is evaluated for the heteronuclear situation. spin½ AXN systems (N = 1, 2,.., 6) evolving under isotropic mixing are also analyzed employing zero-quantum-frame techniques. Several general properties of isotropic mixing are derived which contrast with the corresponding cross-polarization results. Explicit expressions are given for the X-coupled and gX-decoupled A signal as a function of the isotropic mixing period. The effect of two different purge procedures is evaluated for the heteronuclear case, and general conclusions are drawn about the intensity and time development of the multiplet components in CP and IM. The IM results, except for the discussion of purging, are directly applicable to experiments involving homonuclear spin-locking as well.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:5388
Deposited On:18 Oct 2010 09:12
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