Chemical hydrodynamics of nuclear spin states

• URL: http://arxiv.org/abs/2505.02085v1
• Date: Sun, 04 May 2025 12:38:10 GMT
• Title: Chemical hydrodynamics of nuclear spin states
• Authors: Anupama Acharya, Madhukar Said, Sylwia J. Barker, Marcel Utz, Bruno Linclau, Ilya Kuprov,
• Abstract summary: We report a numerically stable formalism for time-domain quantum mechanical description of nuclear spin dynamics.<n>The formalism is implemented in versions 2.11 and later of the open-source Spinach library.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum mechanical equations of motion are strictly linear in state descriptors, such as wavefunctions and density matrices, but equations describing chemical kinetics and hydrodynamics may be non-linear in concentrations. This incompatibility is fundamental, but special cases can be handled - for example, in magnetic resonance where nuclear spin interactions may be too weak influence concentration dynamics. For processes involving single spins and first-order chemical reactions, this is a well-researched topic, but time evolution of complex nuclear spin systems in the presence of second-order kinetics, diffusion, and flow has so far remained intractable. This creates obstacles in microfluidics, homogeneous catalysis, and magnetic resonance imaging of metabolic processes. In this communication we report a numerically stable formalism for time-domain quantum mechanical description of nuclear spin dynamics and decoherence in the simultaneous presence of diffusion, flow, and second-order chemical reactions. The formalism is implemented in versions 2.11 and later of the open-source Spinach library. As an illustration, we use Diels-Alder cycloaddition of acrylonitrile to cyclopentadiene, yielding endo- and exo-norbornene carbonitrile, in the presence of diffusion and flow in the detection chamber of a microfluidic NMR probe (a finite element model with thousands of Voronoi cells) with a spatially localised stripline radiofrequency coil.

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