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Metastable helium molecules (He$_2^*$) have been generated by striking adischarge in a supersonic expansion of helium gas from a pulsed valve. Whenoperating the pulsed valve at room temperature, 77K, and 10K, the mean velocityof the supersonic beam was measured to be 1900m/s, 980m/s, and 530m/s,respectively. A 55-stage Zeeman decelerator operated in a phase-stable mannerwas then used to further reduce the beam velocity and tune it in the rangebetween 100 and 150m/s. The internal-state distribution of the deceleratedsample was established by photoionization spectroscopy.

Slow and velocity-tunable beams of metastable He$_2$ by multistage Zeeman deceleration