Quantitative Benchmarking of Spectroscopic Homogeneous and Inhomogeneous Linewidth Separation
The study addresses how to separate homogeneous dephasing ($\gamma$) from inhomogeneous broadening ($\sigma$) in spectral linewidths, which are usually mixed together in standard linear fits. It uses two-dimensional coherent spectroscopy (2DCS) by comparing diagonal and cross-diagonal slices to provide an extra constraint. This method significantly reduces the correlation between $\sigma$ and $\gamma$, leading to more accurate parameter determination.