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Durham University

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Publication details for Dr Eckart Wrede

Eardley, J. S., Warner, N., Deng, L., Carty, D. & Wrede, E. (2017). Magnetic trapping of SH radicals. Physical Chemistry Chemical Physics 19(12): 8423-8427.

Author(s) from Durham

Abstract

Magnetic trapping of SH radicals, produced via the photostop technique, has been demonstrated. H2S in a skimmed, supersonic molecular beam was photodissociated at 212.8 nm to produce SH inside a 330 mK deep static magnetic trap. The molecular-beam speed was controlled by the mixing ratio of H2S in Kr to match the recoil velocity of the SH photofragments such that some SH radicals were produced with near-zero laboratory-frame velocity. The density of SH radicals in the 2Π3/2, v = 0, J = 3/2 state was followed by (2+1) REMPI over seven orders of magnitude of signal intensity. 5 ms after photodissociation, SH radicals moving faster than the capture velocity of 13 m/s had left the trap. The 1/e trap lifetime of the remaining SH radicals was 40 ± 10 ms at an estimated density of 5E4 molecules/cm3. Photostop offers a simple and direct way to accumulate absolute ground state molecules in a variety of traps.