Anomalous Ortho-to-Para Ratio of Nuclear Spin Isomers of H2O at Low Temperatures

A theoretical model proposed for nuclear spin isomers of H 2 O molecules located inside the C 60 fullerene explains an anomalously high stability of ortho-H 2 O isomers detected in the experiments reported in [B. Meier et al., Nature Commun. 6 , 8112 (2015)] at a temperature of T = 5 K.