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Acknowledgment. Support for this project is provided by
an NSF Career Award (NSF CHE-0348873), the ACS Petroleum
Research Fund (Grant 38960-G5S), the Northwestern Institute
for Environmental Catalysis (CHE-9810378 and DE-FG02-03-
ER15457), the Northwestern Nanoscale Science and Engineering
Center (EEC-0118025), a NASA Graduate Student Fellowship
in Earth System Science for A.B.V. (NGT-530456), and Shell
Oil Company. We gratefully acknowledge donations by Spectra
Physics and CVI Laser LLC, fruitful discussion with Professor
Karl Scheidt (Northwestern University) and Professor Zhan
Chen (University of Michigan), and helpful comments by one
of the anonymous reviewers.
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