Bacteriochlorophyll a This page summarizes the optical absorption and emission data of Bacteriochlorophyll a that is available in the PhotochemCAD package, version 2.1a (Du 1998, Dixon 2005). I reworked their data to produce these interactive graphs and to provide direct links to text files containing the raw and manipulated data. Although I have tried to be careful, I may have introduced some errors; the cautious user is advised to compare these results with the original sources.

You can resize any of the graphs by clicking and dragging a rectangle. If you hover the mouse over the graph, you will see a pop-up showing the coordinates. One of the icons in the upper right corner will let you export the graph in other formats.


This optical absorption measurement of Bacteriochlorophyll a were made by D. Holten on 09-15-2004 using a .

These measurements were scaled to make the molar extinction coefficient match the value of 92,000cm-1/M at 781.0nm (Connolly, 1982).

Original Data | Extinction Data


The fluorescence emission spectrum of Bacteriochlorophyll a dissolved in toluene. The quantum yield of this molecule is 0.2 (Connolly, 1982). This spectrum was collected by on 09-15-2004 using a .

Original Data | Emission Data


For extinction coefficients and fluorescence quantum yields in diverse solvents, see (Connolly, 1982).


Connolly, J. S., E. B. Samuel and A. F. Janzen (1982) Effects of solvent on the fluorescence properties of bacteriochlorophyll a. Photochem. Photobiol. 36, 565-574.

Dixon, J. M., M. Taniguchi and J. S. Lindsey (2005), "PhotochemCAD 2. A Refined Program with Accompanying Spectral Databases for Photochemical Calculations, Photochem. Photobiol., 81, 212-213.

Du, H., R.-C. A. Fuh, J. Li, L. A. Corkan and J. S. Lindsey (1998) PhotochemCAD: A computer-aided design and research tool in photochemistry. Photochem. Photobiol. 68, 141-142.