Vibrational Stark Spectroscopy on Fluorobenzene with Quantum Cascade Laser Dual Frequency Combs

TL;DR

This paper demonstrates that dual frequency comb quantum cascade laser spectrometers can perform vibrational Stark spectroscopy on fluorobenzene more efficiently and precisely than traditional FTIR methods, with significantly shorter acquisition times and improved signal-to-noise ratio.

Contribution

The study introduces the use of dual frequency comb QCL spectrometers for vibrational Stark spectroscopy, showing advantages over conventional FTIR in speed and precision.

Findings

Dual-comb spectrometer achieves similar qualitative and quantitative results as FTIR.

DCS provides 250 times faster acquisition time.

More precise Stark tuning rate estimation with DCS.

Abstract

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.