Abstract
Molecular rotational states of nitrogen and oxygen molecules at room temperature and atmospheric pressure are excited by femtosecond double- and multi-pulses with variable temporal pulse distances, and quartz-enhanced photoacoustic spectroscopy is used for their detection. A simple extrapolation of measured double-pulse data is presented, which predicts form and position of Raman-excited spectral features and thus enables us to distinguish between spectral lines caused by Raman-scattering- and collision-induced absorption both appearing when excitation by pulse trains is used.
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This work was partly supported by the German Federal Ministry of Education and Research, contract number 13N9475, and by the North Atlantic Treaty Organization, project number SfP-983789.
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Schippers, W., Köhring, M., Böttger, S. et al. Simultaneous detection of Raman- and collision-induced molecular rotations of O2 and N2 via femtosecond multi-pulses in combination with quartz-enhanced photoacoustic spectroscopy. Appl. Phys. B 116, 53–60 (2014). https://doi.org/10.1007/s00340-013-5647-3
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DOI: https://doi.org/10.1007/s00340-013-5647-3