Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 20: Electronic Spectroscopy 2

MO 20.8: Talk

Thursday, March 20, 2014, 18:15–18:30, BEBEL SR144

A new experimental set-up for electronic Stark measurements with rotationally resolved laser induced fluorescence spectroscopy — •Josefin Wilke, Martin Wilke, and Michael Schmitt — Heinrich-Heine-Universität, Institut für Physikalische Chemie I, Düsseldorf

High resolution laser induced fluorescence spectroscopy can be used to assign the electronic nature of excited singlet states. 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. It is also possible to get the permanent electric dipole moment of the ground and the excited state by changing the experimental set-up. These realized technical changes to generate a homogeneous electric field and to modify the polarisation of the laser beam will be presented. The electric field lifts the M degeneracy by the Stark effect and results in a band splitting depending on the intensity of the electric field and on the order of the dipole moment in the ground and in the excited state. By switching the polarization of the laser between horizontal and vertical different selection rules will be applied.