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Simultaneous detection of Raman- and collision-induced molecular rotations of O2 and N2 via femtosecond multi-pulses in combination with quartz-enhanced photoacoustic spectroscopy

: Schippers, W.; Köhring, M.; Böttger, S.; Willer, U.; Flachenecker, G.; Schade, W.


Applied Physics. B 116 (2014), Nr.1, S.53-60
ISSN: 0340-3793
ISSN: 0721-7269
ISSN: 0946-2171
ISSN: 1432-0649
Fraunhofer HHI ()

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.