Radical pair magnetic field effect

An interactive teaching example using a remote Python API and RadicalPy. Adjust the model parameters and request a new field sweep.

https://qubelab-spin-api.onrender.com/

API service URL (change if using another deployment).

Isotropic hyperfine coupling (mT) 1.5 mT Exponential rate (s⁻¹) Maximum field (mT) 5 mT Initial radical-pair state Exchange coupling J (mT) 0.0 mT Dipolar coupling D (mT) 0.0 mT

J and D use RadicalPy's Hamiltonian conventions; these are scalar coupling parameters, not an orientation-averaged dipolar tensor.

Product observable

No simulation has been run yet.

Model assumptions

Two electron spins, with one isotropically coupled ¹H nucleus.
Selectable singlet or triplet initial state, with exponential kinetic model.
Scalar exchange coupling J and dipolar coupling D (both in mT), using RadicalPy conventions.
Field sweep from zero to the selected maximum field.
This is a demonstration model, not a fit to experimental data.

For research use, validate the kinetic scheme, units, normalisation, and simulation settings against the relevant physical model and RadicalPy version.