1. Dep. of Physical Science Southern Utah Univ. 351 W. Center Cedar City UT 84720 USA
2. Lowry A Harper Consulting P.O. Box 772 Watkinsville GA 30677 USA
3. Dep. of Chemical and Materials Engineering, Gina Cody School of Engineering and Computer Science Concordia Univ. 1455 de Maisonneuve Blvd. W., EV 2.285 Montreal Quebec H3G 1M8 Canada
4. Lab. of Applied Physical Chemistry, Faculty of Bioscience Engineering Ghent Univ. Coupure Links 653 Ghent B‐9000 Belgium