Summary: Time-domain analysis of electronic spectra in superfluid 4
J. Eloranta a,*, H.Ye. Seferyan b
, V.A. Apkarian b
Department of Chemistry, University of Jyva¨skyla¨, Survontie 9, 40500 Jyva¨skyla¨, Finland
Department of Chemistry, University of California, Irvine, CA 92697, USA
Received 7 June 2004; in final form 18 July 2004
Electronic absorption spectra of impurities in superfluid helium is developed in time domain, using time-dependent density func-
tional theory to describe liquid 4
He and time-dependent perturbation theory to describe the electronic degrees of freedom of the
impurity. Angularly isotropic potentials are used to describe the moleculehelium interactions in the ground and excited electronic
states. The calculations rationalize experimentally observed phonon side-bands in 4
He droplets and in bulk helium, and allow
assignments of spectral features to specific motions of the liquid.
Ó 2004 Elsevier B.V. All rights reserved.
Optical absorption spectroscopy of atoms and mole-