OSCILLATOR AND DIPOLE STRENGTHS FOR CHLOROPHYLL AND RELATED MOLECULES*

Abstract

Abstract. –Previous calculations of the oscillator and dipole strengths for chlorophyll and related molecules are critically reviewed and, in some cases, important information that was not included in the original published reports is given. Oscillator and dipole strengths are reported for the Qy (0,0) vibronic transition of chlorophyll a, bacteriochlorophyll a, pyrochlorophyll a, pheophytin a, and pyrobacteriochlorophyll a. A medium correction has been explicitly included in the calculation of chlorophyll oscillator and dipole strengths. The proper formulas are summarized for the calculation of oscillator and dipole strengths from visible absorption spectra. Three criteria for the full specification of an oscillator strength or dipole strength calculation are recommended; (i) the formula used must be given explicitly, (ii) it must be made clear whether or not a medium correction was applied (and if a medium correction was applied, then it should be given explicitly), and (iii) the limits of integration over v must be specified.