Ultracold molecular collision dynamics

Is the title of this research paper a contradiction in terms or an oxymoron! Either the molecules were not really ultra cold or if they were, there would not be much collision dynamics! (Caution: Irony)

This article is behind a paywall. This so called American Association for the Advancement of Science (AAAS) would not even allow you to read the abstract of this paper!!! Grrrr! Google search results for this paper indicate that this paper was probably not submitted to a preprint server first.

Ultracold molecular collision dynamics | Science