Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 23: Postersitzung

T 23.13: Poster

Monday, February 29, 2016, 13:30–14:30, VMP4 Foyer

Raman spectroscopic determination of the molecular constants of the hydrogen isotopologues with high accuracy — •Bennet Krasch, Sebastian Mirz, and Robin Größle for the KATRIN collaboration — Karlsruhe Institute for Technology (KIT), Institute for Technical Physics (ITEP), Tritium Laboratory Karlsruhe (TLK)

The interest in the thermodynamic properties of gases as the chemical equilibrium is faced by the challenge of time-consuming and technical extensive experimental setups. One possible solution is the derivation of these properties from the molecular constants. The rotational and vibrational movement of diatomic molecules, as the hydrogen isotopologues, is described by the concept of the rotational anharmonic oscillator. The molecular constants are the free parameters of this concept. Molecular constants themselves can be determined by measuring the line position of rotational and/or rotational transitions e.g. with Raman spectroscopy for hydrogen as it has been done since several years. In this contribution a Raman method was development to measure the molecular constant of the hydrogen isotopologues with high accuracy to obtain reliable results. But not only the method was development but also a complete measurement uncertainty budget was set up. The uncertainty budget contains all possible sources for uncertainties from the measurement period or the analysis process as well the contribution of each single uncertainty. The method and the uncertainty budget were exemplary tested on Deuterium.