A symmetrized PIMD method with rotational projection computes numerically exact tunneling splittings for excited states in molecules like ammonia, matching benchmarks and showing the decrease with J.
Exact tunnelling splittings from symmetrized path integrals,
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Exact tunneling splittings of rotationally excited states from symmetrized path-integral molecular dynamics
A symmetrized PIMD method with rotational projection computes numerically exact tunneling splittings for excited states in molecules like ammonia, matching benchmarks and showing the decrease with J.