To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S3E. Conversion from the water-loop–containing isomer 5M to the highly populated isomer 5Y in the AIMD simulation starting from isomer 5M. Resolving the HONO formation mechanism in the ionosphere via ab initio molecular dynamic simulations Rongxing He, Lei Li, Jie Zhong, Chongqin Zhu, Joseph S. Francisco, and Xiao Cheng Zeng PNAS. 2016. 113:4629-4633 DOI: 10.1073/pnas.1601651113 Download Original Video Browse All Videos »