title: Insight into resolution enhancement in generalized two-dimensional correlation spectroscopy.
abstract: Generalized two-dimensional correlation spectroscopy (2D-COS) can be used to enhance spectral resolution in order to help differentiate highly overlapped spectral bands. Despite the numerous extensive 2D-COS investigations, the origin of the 2D spectral resolution enhancement mechanism(s) is not completely understood. In the work here, we studied the 2D-COS of simulated spectra in order to develop new insights into the dependence of 2D-COS spectral features on the overlapping band separations, their intensities and bandwidths, and their band intensity change rates. We found that the features in the 2D-COS maps that are derived from overlapping bands were determined by the spectral normalized half-intensities and the total intensity changes of the correlated bands. We identified the conditions required to resolve overlapping bands. In particular, 2D-COS peak resolution requires that the normalized half-intensities of a correlating band have amplitudes between the maxima and minima of the normalized half-intensities of the overlapping bands.
authors: Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
authors: Lu
authors: L
authors: Ma
authors: Vitali
authors: V
authors: Sikirzhytski
authors: Zhenmin
authors: Z
authors: Hong
authors: Igor K
authors: IK
authors: Lednev
authors: Sanford A
authors: SA
authors: Asher
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008956:Models, Chemical; D013057:Spectrum Analysis / Q000379:methods*