[1] Department of Chemistry, University of California, Santa Barbara
[2] Department of Chemistry, University of California, Berkeley
[3] Miami Valley Laboratories, Proctor and Gamble Company, Cincinnati, OH
[4] Central Research Laboratory, E. I. Dupont de Nemours and Company, Wilmington, DE
[5] National Bureau of Standards, Washington, DC
[6] Department of Chemistry, University of Missouri, Columbia, MO