title: Microsolvation of molecules in superfluid helium nanodroplets revealed by means of electronic spectroscopy.
abstract: The empirical model explaining microsolvation of molecules in superfluid helium droplets proposes a non-superfluid helium solvation layer enclosing the dopant molecule. This model warrants an empirical explanation of any helium induced substructure resolved for electronic transitions of molecules in helium droplets. Despite a wealth of such experimental data, quantitative modeling of spectra is still in its infancy. The theoretical treatment of such many-particle systems dissolved into a quantum fluid is a challenge. Moreover, the success of theoretical activities relies also on the accuracy and self-critical communication of experimental data. This will be elucidated by a critical resume of our own experimental work done within the last ten years. We come to the conclusion that spectroscopic data and among others in particular the spectral resolution depend strongly on experimental conditions. Moreover, despite the fact that none of the helium induced fine structure speaks against the empirical model for solvation in helium droplets, in many cases an unequivocal assignment of the spectroscopic details is not possible. This ambiguity needs to be considered and a careful and critical communication of experimental results is essential in order to promote success in quantitatively understanding microsolvation in superfluid helium nanodroplets.
authors: Faculty for Chemistry and Pharmacy, Institute for Physical and Theoretical Chemistry, University of Regensburg Regensburg, Germany.
authors: Tobias
authors: T
authors: Premke
authors: Faculty for Chemistry and Pharmacy, Institute for Physical and Theoretical Chemistry, University of Regensburg Regensburg, Germany.
authors: Eva-Maria
authors: EM
authors: Wirths
authors: OSRAM Opto Semiconductors GmbH Regensburg, Germany.
authors: Dominik
authors: D
authors: Pentlehner
authors: Carl Zeiss AG Oberkochen, Germany.
authors: Ricarda
authors: R
authors: Riechers
authors: BASF the Chemical Company Ludwigshafen, Germany.
authors: Rudolf
authors: R
authors: Lehnig
authors: Philips International B.V. Amsterdam, Netherlands.
authors: Alexander
authors: A
authors: Vdovin
authors: Faculty for Chemistry and Pharmacy, Institute for Physical and Theoretical Chemistry, University of Regensburg Regensburg, Germany.
authors: Alkwin
authors: A
authors: Slenczka
keywords: electronic spectroscopy; helium droplets; microsolvation; molecular complexes; molecules; phonon wing; zero phonon line