Yeo, MarkHummon, Matthew T.Collopy, Alejandra L.Yan, BoHemmerling, BoergeChae, EunmiDoyle, JohnYe, Jun2017-02-212015Yeo, Mark, Matthew T. Hummon, Alejandra L. Collopy, Bo Yan, Boerge Hemmerling, Eunmi Chae, John M. Doyle, and Jun Ye. 2015. “Rotational State Microwave Mixing for Laser Cooling of Complex Diatomic Molecules.” Physical Review Letters 114 (22) (June). doi:10.1103/physrevlett.114.223003.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:30403695We demonstrate the mixing of rotational states in the ground electronic state using microwave radiation to enhance optical cycling in the molecule yttrium (II) monoxide (YO). This mixing technique is used in conjunction with a frequency modulated and chirped continuous wave laser to slow longitudinally a cryogenic buffer-gas beam of YO. We generate a flux of YO belowen-USJournal Article2017-02-2110.1103/PhysRevLett.114.223003