# Cold and Slow Molecular Beam

 Title: Cold and Slow Molecular Beam Author: Rasmussen, Julia; Patterson, Dave; Lu, Hsin-I; Wright, Matthew; Doyle, John M. Note: Order does not necessarily reflect citation order of authors. Citation: Lu, Hsin-I, Julia Rasmussen, Matthew J. Wright, Dave Patterson, and John M. Doyle. 2011. Cold and slow molecular beam. Physical Chemistry Chemical Physics 42(13): 18986-18990. Full Text & Related Files: 1104.3901v1.pdf (282.7Kb; PDF) Abstract: Employing a two-stage cryogenic buffer gas cell, we produce a cold, hydrodynamically extracted beam of calcium monohydride molecules with a near effusive velocity distribution. Beam dynamics, thermalization and slowing are studied using laser spectroscopy. The key to this hybrid, effusive-like beam source is a “slowing cell” placed immediately after a hydrodynamic, cryogenic source [Patterson et al., J. Chem. Phys., 2007, 126, 154307]. The resulting CaH beams are created in two regimes. In one regime, a modestly boosted beam has a forward velocity of $$v_f = 65 m s^{−1}$$, a narrow velocity spread, and a flux of 109 molecules per pulse. In the other regime, our slowest beam has a forward velocity of $$v_f = 40 m s{−1}$$, a longitudinal temperature of $$3.6 K$$, and a flux of $$5 \times 10^8$$ molecules per pulse. Published Version: doi:10.1039/c1cp21206k Other Sources: http://arxiv.org/abs/1104.3901v1 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8869721 Downloads of this work: