Theory of the optical spectrum of Na2 on 4He droplets: effects of the zero-point energy of the nearest atoms
Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia
2 Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca, via R. Cozzi 53, 20125 Milano, Italy
Corresponding author: a email@example.com
Published online: 11 August 2009
An analytical theory of the optical transitions of a molecule bound at the surface of a 4He droplet is developed for the case of a strong softening of the excited-state nearest neighbor dynamics. The optical bandwidth is found to be determined by the zero-point kinetic energy released at the transition. The theory is applied to the triplet-triplet optical transition in Na2 molecule, for which an asymmetric vibronic band with no pronounced zero-phonon line is predicted, in good agreement with the experiment.
PACS: 68.43.Pq – Adsorbate vibrations / 67.25.-k – 4He
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009