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Field-free decay of normalized angular momentum 〈Mz(t)/Mz(0)〉 after 155 GHz rotational excitation (average of 35 trajectories). Mz(0) is the initial angular momentum. Dotted line: exponential fit (τ0 = 83 ps). Long dash: decay calculated from η1 obtained by independent fitting at 15 frequencies. Short dash: decay calculated from η1L fitted assuming proportionality to ν.
