Egorov, DimaLahaye, ThierrySchöllkopf, WielandFriedrich, BretislavDoyle, John2023-07-252002Egorov, Dima, Thierry Lahaye, Wieland Schöllkopf, Bretislav Friedrich, and John M. Doyle. 2002. Buffer-Gas Cooling of Atomic and Molecular Beams. Physical Review A 66, no. 4. doi:10.1103/physreva.66.043401. http://dx.doi.org/10.1103/physreva.66.043401.1050-2947https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37376593We demonstrate direct loading and cooling of a thermal beam into a cryogenic helium buffer gas. Our test species is rubidium; we observe a thermal beam with 3x10^13 s^-1 flux entering a cryocell and thermalizing with a 4.2-K buffer gas. There is no evidence of clustering or other spurious loss mechanisms. The cooling technique should be applicable to a wide variety of species, including radicals.en-USAtomic and Molecular Physics, and OpticsJournal Article2023-07-2510.1103/physreva.66.043401