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Discrete visible and near-infrared luminescence of a beam of photoexcited helium clusters is reported. The  emission  lines  are  attributed  to  free  helium  atoms  and  molecules  desorbing  from  clusters  inelectronically  excited  states. Depending  on  the  excitation  energy,  various  atomic  and  molecularsinglet  and  triplet  states  are  involved  in  the  relaxation  process.    With  increasing  cluster  size  theintensity  of  molecular  transitions  becomes  dominant.    The  temperature  of  ejected  molecules  couldbe  estimated  to Tvib,2500K  and Trot,450K  and  is  much  higher  than  that  of  the  cluster  itsel

physical review letters

Discrete Visible Luminescence of Helium Atoms and Molecules Desorbing from Helium Clusters: The Role of Electronic, Vibrational, and Rotational Energy Transfer