1. a Department of Chemistry , University of Arkansas , Fayetteville , AR , 72701
2. b University of Montana , Craig Hall, Box 339, Missoula , MT , 59801
3. c Battelle's Columbus Laboratories, Analytical Chemistry Section , 505 King Avenue, Columbus , OH , 43201
4. d Naval Weapons Center , Code 3851, China Lake , CA , 93555