Berlin 2005 – scientific programme
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MO: Molekülphysik
MO 14: Clusters of Atoms and Small Molecules
MO 14.2: Talk
Friday, March 4, 2005, 17:00–17:15, HU 2091
THE STRUCTURE OF ISOLATED TeSe FROM ROTATIONAL INVESTIGATIONS: SPECTROSCOPIC ANALYSIS, POTENTIAL PARAMETERS, AND HYPERFINE INTERACTION — •Jens-Uwe Grabow1, Deike Banser1, Melanie Schnell1, Emilio J. Cocinero2, Alberto Lesarri2, and Jose L. Alonso2 — 1Institut für Physikalische Chemie und Elektrochemie, Universität Hannover, D-30167 Hannover — 2Departamento de Quimica Fisica, Facultad de Ciencias, Universidad de Valladolid, Prado de la Magdalena, s/n, E-47071 Valladolid
Laser ablated tellurium selenide clusters were isolated in pulsed rare gas supersonic expansions. With the production conditions monitored and optimized by the aid of time-of-flight (TOF) mass spectrometry, surprisingly strong pure rotational transitions originating from energy levels up to J = 6 were found in the frequency range from 3.6 to 26.4 GHz.
As the first intermetallic group VI compound investigated microwave spectroscopically we were able to identify the electronic ground state and the first six vibrationally excited state rotational spectra of 43 isotopomers of the tellurium selenide diatomic in natural abundance by Fourier transform microwave (FT-MW) spectroscopy.
The dataset was analysed using a multi-isotopomer fit to a Dunham-type expression which includes terms that allow for Born-Oppenheimer breakdown corrections. The transitions of 16 isotopomers, either containing 125Te or 123Te and/or 77Se showed splittings due to spin-rotation coupling.