Cold and Slow Molecular Beam

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Cold and Slow Molecular Beam

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Title: Cold and Slow Molecular Beam
Author: Rasmussen, Julia; Patterson, Dave; Lu, Hsin-I; Wright, Matthew; Doyle, John M.

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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.
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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
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