Dresden 2011 – scientific programme

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MO: Fachverband Molekülphysik

MO 23: Electronic Spectroscopy II

MO 23.4: Talk

Thursday, March 17, 2011, 15:30–15:45, MER 02

Rovibronic states of 1,2,3,4-Tetrahydrocarbazole revealed by high resolution electronic spectroscopy — •Olivia Oeltermann¹, Christian Brand¹, Leo Meerts², and Michael Schmitt¹ — ¹Heinrich-Heine-Universität, Institut für Physikalische Chemie I, Düsseldorf — ²Radboud University Nijmegen, Institute for Molecules and Materials, Nijmegen

The rotationally resolved LIF spectrum of the electronic origin of 1,2,3,4-Tetrahydrocarbazole was measured in order to determine structural parameters in the ground and electronically excited state. Comparison of our experimental results and ab initio calculations reveals, that the saturated six-membered ring in Tetrahydrocarbazole has twist conformation in both states. It could be shown, that the lowest excited singlet state of 1,2,3,4-Tetrahydrocarbazole has ¹L_a character and not ¹L_b, like nearly all other other indole derivatives, except for 2,3-Dimethylindole. The upper limit for energy difference between ¹L_a and ¹L_b can be estimated to be 1000 cm⁻¹, with the ¹L_b being structurally and energetically close to the intersection of both states.