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We present experiments in which an ultra-cold sample of ammonia molecules isreleased from an electrostatic trap and recaptured after a variable time. It isshown that, by performing adiabatic cooling before releasing the molecules andadiabatic re-compression after they are recaptured, we are able to observemolecules even after more than 10 ms of free expansion. A coherent measurementperformed during this time will have a statistical uncertainty that decreasesapproximately as the inverse of the square root of the expansion time. Thisoffers interesting prospects for high-resolution spectroscopy and precisiontests of fundamental physics theories.

Preparation of an ultra-cold sample of ammonia molecules for precision measurements