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Ultracold matter

Ultracold matter

Laser cooling of polyatomic molecules brings ultracold chemistry into the spotlight

01 Jun 2022
Photo of the optical setup used in the experiment, showing various optics bathed in green and red light
Red light stop: The experiment uses multiple frequencies of light to cool the CaOH atoms to a fraction of a degree above absolute zero. (Courtesy: John Doyle)
Physicists in the US have created ultracold polyatomic molecules by trapping and cooling them direct

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Martijn Boerkamp is a science journalist based in the Netherlands
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