(A) Spectrogram of the CS₂/benzene mixture with three regions of interest (R1, R2, and R3) highlighted. R1 shows the resonant response from the CS₂ 656 cm⁻¹ peak, while R2 shows the resonant response of the 991 cm⁻¹ benzene peak. R3 highlights the instrument response function, used to measure the temporal profile of the probe pulse. (B) The instrument response as measured from a lineout in region R3, with a Gaussian fit to the central maximum, with full-width-at-half-maximum (FWHM) of 265 fs.