  We demonstrate the performance of a dual frequency comb QCL spectrometer for
the application of vibrational Stark spectroscopy. Measurements performed on
fluorobenzene with the dual-comb spectrometer (DCS) were compared to results
obtained using a conventional Fourier transform infrared (FTIR) instrument in
terms of spectral response, parameter estimation, and signal-to-noise ratio.
The dual-comb spectrometer provided similar qualitative and quantitative data
as the FTIR setup in 250 times shorter acquisition time. For fluorobenzene, the
DCS measurement resulted in a more precise estimation of the fluorobenzene
Stark tuning rate ((0.81 +/- 0.09) cm-1/(MV/cm)) than with the FTIR system
((0.89 +/- 0.15) cm-1/(MV/cm)). Both values are in accordance with the
previously reported value of 0.84 cm-1/(MV/cm). We also point to an improvement
of signal to noise ratio (SNR) in the DCS configuration. Additional
characteristics of the dual-comb spectrometer applicable to vibrational Stark
spectroscopy and their scaling properties for future applications are
discussed.
