Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 3: Electronic Spectroscopy 1

MO 3.3: Vortrag

Montag, 29. Februar 2016, 15:00–15:15, f102

Electronic Stark measurements with rotationally resolved laser induced fluorescence spectroscopy — •Josefin Wilke, Martin Wilke, and Michael Schmitt — Institute for Physical Chemistry I, Heinrich-Heine-University, Düsseldorf

High resolution laser induced fluorescence spectroscopy can be used to assign the electronic nature of electronically excited singlet states to be ¹L_a and ¹L_b states in the nomenclature of Platt. Therefore, several molecular parameters like the orientation of the transition dipole moment, the changes of the bond lengths, or the frontier orbital contribution upon excitation are needed to determine the electronic nature. Also the permanent electric dipole moment of the ground and the first excited states can be used for the assignment, because the ¹L_a state has a larger permanent dipole moment than the unpolar ¹L_b state. Therefore, a homogeneous electric field is needed, which lifts up the M degeneracy by the Stark effect. By changing the polarization of the excitation light from parallel to perpendicular related to the orientation of the electric field different field configurations which are linked to the selection rules ΔM=0 and ΔM=±1 can be measured. In this talk recent results for the permanent dipole moments of planar substituted indoles will be presented.