Cold and Slow Molecular Beam
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. One modestly boosted beam has a forward velocity of vf = 65 m/s, a narrow velocity spread, and a flux of 10^9 molecules per pulse. The other has the slowest forward velocity of vf = 40 m/s, a longitudinal temperature of 3.6 K, and a flux of 5x10^8 molecules per pulse.
Cite
@article{arxiv.1104.3901,
title = {Cold and Slow Molecular Beam},
author = {Hsin-I Lu and Julia Rasmussen and Matthew J. Wright and Dave Patterson and John M. Doyle},
journal= {arXiv preprint arXiv:1104.3901},
year = {2017}
}