Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster II
Q 43.17: Poster
Wednesday, March 20, 2013, 16:00–18:30, Empore Lichthof
A sample-free calibration method for quantitative Raman spectroscopy of hydrogen isotopologues — Magnus Schlösser1, •Simone Rupp1, Hendrik Seitz1, Sebastian Fischer1, Beate Bornschein1, Timothy M. James2, and Helmut H. Telle2 — 1Institute for Technical Physics, Tritium Laboratory Karlsruhe, Karlsruhe Institute of Technology, Germany — 2Department of Physics, Swansea University, United Kingdom
Accurate composition measurements of gaseous samples of hydrogen isotopologues (H2, D2, T2, HD, HT, DT) are of high importance in various fields of research. One example is the KArlsruhe TRItium Neutrino Experiment (KATRIN), which uses a gaseous tritium source as β-emitter for a high-sensitivity measurement of the neutrino mass. Impurities of all other hydrogen isotopologues are present in the T2-source; their concentrations have to be measured accurately in order to minimize systematic uncertainties in the neutrino mass measurement.
Raman spectroscopy is a favorable technique for composition measurements, allowing for non-contact, in-line and multispecies gas analysis with high sensitivity. The quantitative analysis of Raman spectra requires a calibration of the Raman system employed. This poster presents a sample-free calibration method which allows to determine the calibration factors for all six hydrogen isotopologues. The approach makes use of theoretical Raman signal amplitudes, i.e. it combines theoretical Raman intensities with a measurement of the spectral sensitivity of the Raman system. The obtained results were successfully verified by an independent calibration method using gas samples.