Phys. Rev. Lett. 78, 4371–4374 (1997)Discrete Visible Luminescence of Helium Atoms and Molecules Desorbing from Helium Clusters: The Role of Electronic, Vibrational, and Rotational Energy TransferReceived 24 March 1997; published in the issue dated 9 June 1997 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 in electronically excited states. Depending on the excitation energy, various atomic and molecular singlet and triplet states are involved in the relaxation process. With increasing cluster size the intensity of molecular transitions becomes dominant. The temperature of ejected molecules could be estimated to Tvib∼2500K and Trot∼450K and is much higher than that of the cluster itself. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.4371
DOI:
10.1103/PhysRevLett.78.4371
PACS:
36.40.Mr, 33.50.Dq, 36.40.Qv
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