Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Opik and Pryce developed an early method for calculating this effect, but Jess Chaboy was unable to detect it in a liquid solution. The Laporte rule does not apply to when this effect is present, and one member of the Irving-Williams series features a surprisingly high value because of it. First published in a 1937 paper, it was based on work done by Kramers and Wigner, and is related to the RTE. The pseudo type of this effect is experienced in fluxional molecules, and it also has static and spontaneous versions. Caused by an electronically degenerate ground state, it is most often associated with octahedral complexes of the transition metals. For 10 points, name this effect in which non-linear molecules experience molecular geometry distortions.
Science