1. Materials Science and Technology Division; Oak Ridge National Laboratory; P. O. Box 2008, MS-6063 Oak Ridge TN 37831-6063 USA
2. Energy and Transportation Science Division; Oak Ridge National Laboratory; P. O. Box 2008, MS-6181 Oak Ridge TN 37831-6181 USA
3. Technology Center Houston; Shell Global Solutions; Houston TX 77082-3101 USA
4. Chemical Sciences Division; Oak Ridge National Laboratory; P. O. Box 2008, MS-6201 Oak Ridge TN 37831-6201 USA