Event DetailsEvent Dates: Thursday, April 16, 2015 - 4:00pmSeminar Location: JILA X317Speaker Name(s): Jonathan WeinsteinSpeaker Affiliation(s): JILA Visiting Fellow; University of Nevada Seminar Type/SubjectScientific Seminar Type: JILA Public SeminarEvent Details & Abstract: Using a cryogenic helium buffer gas, we cool atoms and molecules to temperatures as low as 1 Kelvin. When lithium atoms are introduced into the helium buffer gas, LiHe molecules rapidly form through three-body recombination. These weakly-bound van der Waals molecules exist in a qualitatively different regime than typical diatomic molecules, a regime accessible only at cold temperatures. We have spectroscopically detected the single bound rovibrational state of LiHe, measured its equilibrium thermodynamic properties, and measured its reaction rate coefficient. Initial measurements of the titanium-helium molecule will also be presented. As time and interest allow, we will also discuss our work on cold two-body chemical reactions and optical pumping of alkali atoms frozen in solid noble gases and parahydrogen.