Using the multi-comb ideas presented in our previous paper on cavity-enhanced 2DIR spectroscopy, and major recent advances in mid-IR and long-wave IR frequency combs, high-resolution 2DIR spectroscopy of gasses is poised to become a powerful method for multi-species trace gas analysis. In two articles posted today, we present a comprehensive theoretical treatment of rotationally-resolved 2DIR (RR2DIR) spectroscopy and several new polarization conditions that can be used to bring clarity to RR2DIR spectra.
