Photostop: Production of zero-velocity molecules by photodissociation in a molecular beam

Details Photostop: Production of zero-velocity molecules by photodissociation in a molecular beam Photostop: Production of zero-velocity molecules by photodissociation in a molecular beam

2010-02-19

arxiv.org/abs/1002.3698v1

Physics

Chemical Physics

6 pages, 3 figures

Scientific paper

We have demonstrated a new, accessible and economical technique, dubbed photostop, for producing high densities of trappable molecules. Direct measurements are presented of NO molecules produced with a narrow velocity distribution centered at zero in the laboratory frame. NO2, initially cooled in a pulsed molecular beam, is photodissociated such that the recoil velocity of the NO photofragments cancels out the velocity of the beam. NO(X^2Pi_3/2, v=0, J=1.5) molecules are observed up to 10 mircoseconds after the dissociation event in the probe volume at an estimated density of 1E7 cm-3 per quantum state and at a translational temperature of 1.6 K. Through the choice of suitable precursors, photostop has the potential to extend the list atoms and molecules that can be slowed or trapped. It should be possible to accumulate density in a trap through consecutive loading of multiple pulses.

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