[1] Univ Hawaii Manoa, Dept Chem, Honolulu, HI 96822 USA
[2] Florida Int Univ, Dept Chem & Biochem, Miami, FL 33199 USA
[3] Acad Sinica, Res Ctr Environm Changes, Taipei 115, Taiwan
[4] Natl Cent Univ, Grad Inst Astron, Jhongli 320, Taiwan
[5] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
[6] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA