Sharp line vibronic spectra of chlorophyll and its derivatives in solid solutions

Abstract

Sharp-line fluorescence and excitation spectra of chlorophyll-a and six of its closest derivatives in frozen solutions at liquid helium temperature under monochromatic laser excitation are reported. About 30 vibrational frequencies in the excited electronic state are determined for each compound. Purely homogeneous linewidths are measured by the hole-burning method at T = 5 and 1.8 K.