1. R. S. Mulliken, J. Chem. Phys. 3, 506 (1935).JCPSA60021-9606
2. ε = (1/cl logI0/I when c is in mole/liter and 1 is in cm.
3. Harrison, Gaddis, and Coffin, J. Chem. Phys. 18, 221 (1950).JCPSA60021-9606
4. A. Clow and G. Pearson, Nature 144, 208 (1939).NATUAS0028-0836
5. Supplied to this laboratory by R. F. Robey, Esso Laboratories, Standard Oil Development Company.