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Stimulated Raman rotational photoacoustic spectroscopy using a quartz tuning fork and femtosecond excitation

: Schippers, W.; Gershnabel, E.; Burgmeier, J.; Katz, O.; Willer, U.; Averbukh, I.S.; Silberberg, Y.; Schade, W.


Applied Physics. B 105 (2011), Nr.2, S.203-211
ISSN: 0340-3793
ISSN: 0721-7269
ISSN: 0946-2171
ISSN: 1432-0649
Fraunhofer HHI ()

Molecular alignment of linear molecules (O2, N2, CO2 and CO) is measured photoacoustically in the gas phase. The rotational excitation is accomplished using a simple femtosecond stimulated Raman excitation scheme, employing two femtosecond pulses with variable delay between the pulses. Molecular alignment is determined directly by measuring the energy dumped into the gas by quartz-enhanced photoacoustic spectroscopy (QEPAS), utilizing a quartz tuning fork as a sensitive photoacoustic transducer. The experimental results demonstrate for the first time the use of a tuning fork for resonant photoacoustic detection of Raman spectra excited by femtosecond double pulses and match both simulation and literature values.