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Issue 42, 2011
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A cold and slow molecular beam

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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 vf = 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 vf = 40 m s−1, a longitudinal temperature of 3.6 K, and a flux of 5 × 108 molecules per pulse.

Graphical abstract: A cold and slow molecular beam

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Publication details

The article was received on 15 Apr 2011, accepted on 27 Jun 2011 and first published on 27 Jul 2011

Article type: Paper
DOI: 10.1039/C1CP21206K
Citation: Phys. Chem. Chem. Phys., 2011,13, 18986-18990

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    A cold and slow molecular beam

    H. Lu, J. Rasmussen, M. J. Wright, D. Patterson and J. M. Doyle, Phys. Chem. Chem. Phys., 2011, 13, 18986
    DOI: 10.1039/C1CP21206K

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