Zeeman Relaxation of CaF in Low-Temperature Collisions with Helium

Maussang, Kenneth; Egorov, Dima; Helton, Joel S.; Nguyen, Scott V.; Doyle, John M.

doi:10.1103/physrevlett.94.123002

Cited by 72 publications

(75 citation statements)

References 30 publications

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“…Radicals with high ablation yields (e.g. CaF, 10 13 per pulse 31 ) naturally increase the output molecular beam flux. Molecules in gas form at room temperature have been introduced into buffer gas cells via capillary fill lines.…”

Section: Applicationsmentioning

confidence: 99%

A cold and slow molecular beam

Rasmussen

Wright

et al. 2011

Phys. Chem. Chem. Phys.

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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. One modestly boosted beam has a forward velocity of v f = 65 m/s, a narrow velocity spread, and a flux of 10 9 molecules per pulse. The other has the slowest forward velocity of v f = 40 m/s, a longitudinal temperature of 3.6 K, and a flux of 5 × 10 8 molecules per pulse.

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Section: Applicationsmentioning

confidence: 99%

A cold and slow molecular beam

Rasmussen

Wright

et al. 2011

Phys. Chem. Chem. Phys.

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“…When trapped CaF collides with 3 He, three collisional processes can occur: elastic collision, spin depolarization, and rotational state changing. These collisional properties of CaF with 3 He at 2 K were studied by Maussang et al [41]. It was argued that the spin depolarization of N = 1 is much more efficient than N = 0 and a lower bound of γ N=1 > 8000 could be placed.…”

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Magnetic Trapping of Molecules via Optical Loading and Magnetic Slowing

Kozyryev

Hemmerling

et al. 2014

Phys. Rev. Lett.

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Calcium monofluoride (CaF) is magnetically slowed and trapped using optical pumping. Starting from a collisionally cooled slow beam, CaF with an initial velocity of ∼ 30 m/s is slowed via magnetic forces as it enters a 800 mK deep magnetic trap. Employing two-stage optical pumping, CaF is irreversibly loaded into the trap via two scattered photons. We observe a trap lifetime exceeding 500 ms, limited by background collisions. This method paves the way for cooling and magnetic trapping of chemically diverse molecules without closed cycling transitions.

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“…However, the buffer-gas method allowed studies of cold atompolar molecule spin relaxation of trapped molecules (HeCaH and CaF [20,25]). Collisional quenching of rotational and electronic excited states has been seen in earlier experiments [27][28][29].…”

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Magnetic Trapping and Zeeman Relaxation of NH (X Σ−3)

et al. 2007

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Imidogen (NH) radicals are magnetically trapped and their Zeeman relaxation and energy transport collision cross sections with helium are measured. Continuous buffer-gas loading of the trap is direct from a room-temperature molecular beam. The Zeeman relaxation (inelastic) cross section of magnetically trapped electronic, vibrational and rotational ground state imidogen in collisions with 3 He is measured to be 3.8 ± 1.1 × 10 −19 cm 2 at 710 mK. The NH-He energy transport cross section is also measured, indicating a ratio of diffusive to inelastic cross sections of γ = 7 × 10 4 , in agreement with recent theory [1].

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Zeeman Relaxation of CaF in Low-Temperature Collisions with Helium

Cited by 72 publications

References 30 publications

A cold and slow molecular beam

A cold and slow molecular beam

Magnetic Trapping of Molecules via Optical Loading and Magnetic Slowing

Magnetic Trapping and Zeeman Relaxation of NH (X Σ−3)

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