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Helium nanodroplets are fascinating many-body quantum systems which feature unique properties such as an extremely low internal temperature (0.38 K), nanoscopic superfluidity, and the ability to efficiently cool and aggregate embedded species together with chemical neutrality.
Therefore, they are widely used as nearly ideal matrices for high resolution spectroscopy of isolated atoms and molecules, and a very cold “nano-reactor” for chemical or photochemical and photophysical processes