Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 195, Issue 1, Pages 45-51Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2008.08.008
Keywords
NMR; EPR; Spin; Simulation; Scaling
Funding
- EPSRC [EP/F065205/1]
- Engineering and Physical Sciences Research Council [EP/F065205/1] Funding Source: researchfish
- EPSRC [EP/F065205/1] Funding Source: UKRI
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We extend the recently proposed state-space restriction (SSR) technique for quantum spin dynamics simulations [Kuprov et al., J. Magn. Reson. 189 (2007) 241-250] to include on-the-fly detection and elimination of unpopulated dimensions from the system density matrix. Further improvements in spin dynamics simulation speed, frequently by several orders of magnitude, are demonstrated. The proposed zero track elimination (ZTE) procedure is computationally inexpensive, reversible, numerically stable and easy to add to any existing simulation code. We demonstrate that it belongs to the same family of Krylov sub-space techniques as the well-known Lanczos basis pruning procedure. The combined SSR + ZTE algorithm is recommended for simulations of NMR, EPR and Spin Chemistry experiments on systems containing between 10 and 104 coupled spins. (C) 2008 Elsevier Inc. All rights reserved
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