Erlangen 2018 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 22: Posters 3: Experimental and Theoretical Techniques and High Resolution Spectroscopy
MO 22.17: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Zelt West
High-resolution spectroscopy of tritiated water and analysis of the 2ν1 mode of HTO — •Johannes Müller1, Magnus Schlösser1, Frank Hase2, Nicolas Ziegler1, Robin Größle1, David Hillesheimer1, and Johannes Orphal2 — 1Institute for Technical Physics, Tritium Laboratory Karlsruhe (TLK), Karlsruhe Institute of Technology, Germany — 2Institute for Meteorology and Climate Research (IMK-ASF), Karlsruhe Institute of Technology, Germany
By measuring vibrational and rotational states of tritiated water using high-resolution FTIR spectroscopy, one can obtain data to validate or restrict quantum mechanical models of small molecules at high precision, such as water. Whereas spectroscopy of the H2O, HDO and D2O isotopologues is easily feasible at high accuracy as there are no restrictions on the sample amount, tritiated water is much harder to grasp. Due to its radiotoxicity and radiochemical activity, handling of tritiated water and gaseous tritium is only possible in a handful facilities worldwide. Therefore, a joint venture between the TLK, providing the tritium and experience in handling it, and the IMK-ASF, providing the expertise in high-resolution FTIR spectroscopy, was formed. We will describe how tritiated water is produced in a tritium compatible optical cell and how the high-resolution spectrometry is performed. We focus on the analysis the 2ν1 mode in the ro-vibrational spectrum of HTO which has never been measured before. We present rotational and centrifugal distortion constants of HTO, which allow us to access the fundamental structure and dynamic of this fascinating molecule.