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William M. Jackson
Professor Emeritus

Email: jackson@chem.ucdavis.edu
Phone:(530) 752-0504

B.S., Morehouse College, 1956.
Ph.D., Catholic University of America, 1961.
Research Scientist, Martin-Marietta Company, Maryland, 1961-63.
National Research Council Postdoctoral Research Associate, National Bureau of Standards, National Academy of Sciences, Washington, D.C., 1963-64.
Staff Chemist; Staff Scientist, Goodard Space Flight Center, NASA, 1964-69; 1969-74.
Visiting Associate Professor, University of Pittsburgh, 1969-70.
Appointed to faculty, Howard University, 1974-85.
Appointed to faculty, UC Davis, 1985-.
German Academic Exchange Service Study Fellowship, Astrophysics Institute at the University of Erlangen, Germany, 1981.
Miller Professor, University of California, 1988.
Guggenheim Fellow, 1989.
Alexander von Humboldt Foundation, Humboldt Research Award for Senior US Scientist, 1996.
American Association for the Advancement of Science 1997 - Lifetime Mentor Award.
Group Page
Principal Research Interests
Laser chemistry, laser photochemistry, and cometary astrochemistry.Photodissociation of ions and molecules is being studied using velocity-ion-imaging to determine the identity, velocity and angular distribution of the fragments. Four-wave-mixing techniques are used to generate vacuum-ultraviolet-wavelength for both photodissociation and photoionization. The molecules that are being investigated are the ones that are important for understanding molecules that are present in comets, planetary atmospheres and the interstellar medium.
Representative Publications

1. Photodissociation of the Acetone Cation at 355 nm using the Velocity Imaging Technique, William M. Jackson, and Dadong Xu, J. Chem. Phys. 113, 3651-3657(2000).

2. Velocity Imaging Studies Using a Vacuum Ultraviolet Laser , W. M. Jackson, D. Xu, R. J. Price, K. L. McNesby, and I. A. McLaren. ACS Symposium Series, 770, Imaging in Chemical Dynamics, A. G. Suits and R. E. Continetti, Eds. American Chemical Society, Washington, DC, (2001), pp. 103-125.

3. Photodissociation of ethyl bromide cation at 355 nm by means of TOF-MS and ion velocity imaging techniques, Dadong Xu, Roosevelt J. Price, Jianhua Huang and William M. Jackson, Zeitschrift für Physikalische Chemie, 215, 253-271(2001).

4. Detection and measurement of middle distillate fuel vapors by use of tunable diode lasers, K.L. McNesby, R.T. Wainner, R.G. Daniel, R.R. Skaggs, J.B. Morris, A.W. Miziolek, W.M. Jackson, and I. A. McLaren, Applied Optics, Vol. 40, pp. 840-845 (2001).

5. Branching ratios of C2 products in the photodissociation of C2H at 193 nm . A. M. Mebel, A. H. H. Chang, M. Hayashi, W. M. Jackson, Y.-C. Hsu, and S. H. Lin, J. Chem. Phys., Vol. 114, pp. 9821-9831(2001).

6. Photodissociation of the dibromomethane cation at 355 nm by means of ion Velocity imaging, J. Huang, Dadong Xu, W. H. Fink, and W. M. Jackson, J. Chem. Phys., 115, 6012-6017(2001).

7. Ultraviolet photodissociation of Bromoform at 234 and 267 nm by means of ion velocity imaging, Dadong Xu, J. S. Francisco. J. Huang, and W. M. Jackson, J. Chem. Phys., 117, 2578-2585(2002).

8. Photodissociation of carbonic dibromide at 267 nm: Observation of three-body dissociation and molecular elimination of Br2, Dadong Xu, Jianhua Huang, J. S. Francisco, J. C. Hansen, and W. M. Jackson, J. Chem. Phys., 117, 7483-7490(2002).

9. New Experimental and Theoretical Techniques for studying Photochemical Reaction of Cometary Atmospheres, William M. Jackson, Dadong Xu, Jianhua Huang, Roosevelt J. Price, and David H. Volman, Earth, Moon, and Planets, 89, 197-220, 2002.

10. Photodissociation of Bromoform cation at 308, 355, and 610 nm by means of time of flight mass spectrometry and ion velocity imaging, Jianhua Huang, Dadong Xu, Joseph S. Francisco and William M. Jackson, J. Chem. Phys., 118, 3083(2003).

11. One photon dissociation and multiphoton dissociative ionization of Bromo-chlorodifluoromethane (CF2BrCl) in the 267 nm region, Jianhua Huang, Dadong Xu, Joseph S. Francisco, and William M. Jackson , J. Chem. Phys. 119, 3661-3669 (2003).

12. Reinvestigation of CS2 dissociation at 193 nm by means of product state selective VUV laser ionization and velocity imaging, Dadong Xu, Jianhua Huang, and William M. Jackson, J. Chem. Phys., 120, 3051(2004).

13. A Measurement of the autoionization lifetime of the super excited atomic sulphur S(3s23p3(2Do)4d) state using a tuneable vacuum ultraviolet (VUV) laser, J. Huang, D. Xu, A. Stuchebrukhov, and William M. Jackson, Can. J. Chem., 82, June p.885-890 (2004).

14. Detection of Parent molecules in Comets using UV and visible spectroscopy, Jackson, W. M., & Scodinu, A. in: "New" Rosetta Target, Colangeli, L., Epifani, E. M., & Palumbo, P. Kluwer Academic Publishers, The Netherlands; Astrophysics & Space Science Library, 85-95(2004).

15. Using the ultraviolet and visible spectrum of Comet 122P/de Vico to identify the parent molecule CS2. Jackson, W. M.; Scodinu, A.; Xu, D.; Cochran, A. L. The Astrophys. J., 607, L139 (2004).

16. Photodissociation studies of CBr4+ and CBr3+ at 267 nm using ion velocity imaging. Jamila R. Greene, Joseph S. Francisco, Jianhua Huang, Dadong Xu, and William M. Jackson, J. Chem. Phys. 121, 5868-5873(2004).

17. Photodissociation of CCH: Classical trajectory calculations involving seven electronic states. Goksin Apaydin, William H. Fink, and William M. Jackson, J. Chem. Phys. 121, 9368-9377(2004).

18. Velocity Imaging Studies on Ion-Pair Dissociation of CH3Br + hνVUV  CH3+ + Br - as a function of wavelength, Dadong Xu, Jianhua Huang, Roosevelt J. Price, William M. Jackson, J. Phys. Chem. A, 108, 9916-9923(2004).

19. Single photon spectroscopy of singlet sulfur atoms and the autoionization lifetime measurements of the superexcited singlet states”, Jianhua Huang, Dadong Xu, Alexei Stuchebrukhov and William M. Jackson, J. Chem. Phys., 122, 4321-4329(2005).

20. Deep Impact: Observations from a Worldwide Earth-Based Campaign, K. J. Meech, N. Ageorges, M. F. A'Hearn, C. Arpigny, A. Ates, J. Aycock, S. Bagnulo, J. Bailey, R. Barber, L. Barrera, R. Barrena, J. M. Bauer, M. J. S. Belton, F. Bensch, B. Bhattacharya, N. Biver, G. Blake, D. Bockelée-Morvan, H. Boehnhardt, B. P. Bonev, T. Bonev, M. W. Buie, M. G. Burton, H. M. Butner, R. Cabanac, R. Campbell, H. Campins, M. T. Capria, T. Carroll, F. Chaffee, S. B. Charnley, R. Cleis, A. Coates, A. Cochran, P. Colom, A. Conrad, I. M. Coulson, J. Crovisier, J.m deBuizer, R. Dekany, J. de Léon, N. Dello Russo, A. Delsanti, M. DiSanti, J. Drummond, L. Dundon, P. B. Etzel, T. L. Farnham, P. Feldman, Y. R. Fernández, M. D. Filipovic, S. Fisher, A. Fitzsimmons, D. Fong, R. Fugate, H. Fujiwara, T. Fujiyoshi, R. Furusho, T. Fuse, E. Gibb, O. Groussin, S. Gulkis, M. Gurwell, E. Hadamcik, O. Hainaut, D. Harker, D. Harrington, M. Harwit, S. Hasegawa, C. W. Hergenrother, P. Hirst, K. Hodapp, M. H! onda, E. S. Howell, D. Hutsemékers, D. Iono, W.-H. Ip, W. Jackson, E. Jehin, Z. J. Jiang, G. H. Jones, P. A. Jones, T. Kadono, U. W. Kamath, H. U. Käufl, T. Kasuga, H. Kawakita, M. S. Kelley, F. Kerber, M. Kidger, D. Kinoshita, M. Knight, L. Lara, S. M. Larson, S. Lederer, C.-F. Lee, A. C. Levasseur-Regourd, J. Y. Li, Q.-S. Li, J. Licandro, Z.-Y. Lin, C. M. Lisse, G. LoCurto, A. J. Lovell, S. C. Lowry, J. Lyke, D. Lynch, J. Ma, K. Magee-Sauer, G. Maheswar, J. Manfroid, O. Marco, P. Martin, G. Melnick, S. Miller, T. Miyata, G. H. Moriarty-Schieven, N. Moskovitz, B. E. A. Mueller, M. J. Mumma, S. Muneer, D. A. Neufeld, T. Ootsubo, D. Osip, S. K. Pandea, E. Pantin, R. Paterno-Mahler, B. Patten, B. E. Penprase, A. Peck, G. Petitas, N. Pinilla-Alonso, J. Pittichova, E. Pompei, T. P. Prabhu, C. Qi, R. Rao, H. Rauer, H. Reitsema, S. D. Rodgers, P. Rodriguez, R. Ruane, G. Ruch, W. Rujopakarn, D. K. Sahu, S. Sako, I. Sakon, N. Samarasinha, J. M. Sarkissian, I. Saviane, M. Schirmer! , P. Schultz, R. Schulz, P. Seitzer, T. Sekiguchi, F. Selman, M. Serra -Ricart, R. Sharp, R. L. Snell, C. Snodgrass, T. Stallard, G. Stecklein, C. Sterken, J. A. Stüwe, S. Sugita, M. Sumner, N. Suntzeff, R. Swaters, S. Takakuwa, N. Takato, J. Thomas-Osip, E. Thompson, A. T. Tokunaga, G. P. Tozzi, H. Tran, M. Troy, C. Trujillo, J. Van Cleve, R. Vasundhara, R. Vazquez, F. Vilas, G. Villanueva, K. von Braun, P. Vora, R. J. Wainscoat, K. Walsh, J. Watanabe, H. A. Weaver, W. Weaver, M. Weiler, P. R. Weissman, W. F. Welsh, D. Wilner, S. Wolk, M. Womack, D. Wooden, L. M. Woodney, C. Woodward, Z.-Y. Wu, J.-H. Wu, T. Yamashita, B. Yang, Y.-B. Yang, S. Yokogawa, A. C. Zook, A. Zauderer, X. Zhao, X. Zhou, and J.-M. Zucconi, Science, 310, 265-269(2005).

21. Deep Impact : High Resolution Optical Spectroscopy with the ESO VLT and the Keck 1 telescope", E. Jehin, J. Manfroid, D. Hutsemekers, A. L. Cochran, C. Arpigny, W. M. Jackson, H. Rauer, R. Schulz, and J.-M. Zucconi, Ap. J. 641, L145 - L148(2006).

22. Photodissociation dynamics of CBr4 at 267 nm by means of ion velocity imaging, Jamila R. Greene, Joseph S. Francisco, Dadong Xu, Jianhua Huang, and William M. Jackson, J. Chem. Phys., 125, 133311 (2006) (9 pages).

23. An Astronomical Pump Probe Experiment with Deep Impact and the KeckTelescope, William M. Jackson, Micah Glaz, Anita L. Cochran, and Karen J. Meech, AIP Conference Proceedings, 855, 183-193(2006).

24. Observations of Comet 9P/Tempel 1 with the Keck 1 HIRES Instrument During Deep Impact, Anita L. Cochran, William M. Jackson, Karen J. Meech, and Micah Glaz, Icarus, 187, 156-166(2007).

25. The impact and rotational light curves of Comet 9P/Tempel 1, Jean Manfroid, Damien Hutsemékers, Emmanuël Jehin, Anita L. Cochran, Claude Arpigny, William M. Jackson, Karen J. Meech, Rita Schulz and Jean-Marc Zucconi, Icarus, 187,144-155(2007).

26. A vacuum ultraviolet laser photoionization and pulsed field ionization study of nascent S(3P2,1,0) and S(1D2) formed in the 193.3 nm photodissociation of CS2. Jingang Zhou, Brant Jones, Xueliang Yang, W. M. Jackson,a) and C. Y. Ng, J. Chem. Phys., 128, 014305-014305-9(2008).

27. Vacuum ultraviolet excitation spectroscopy of the autoionizing Rydberg states of atomic sulfur in the 73,350-84,950 cm-1 frequency range”, Xueliang Yang, Jingang Zhou, Brant Jones, C. Y. Ng, and William M. Jackson, J. Chem. Phys., 128, 084303-084303-9 (2008).

28. Parameters contributing to efficient ion generation in aerosol MALDI mass spectrometry”, E. McJimpsey, W. Jackson, C. Lebrilla, H. Tobias, M. Bogan, E. Gard, M. Frank, P. Steele, Journal of the American Society of Mass Spectrometry, 19, 315-324(2008).

29. Keck 1 HIRES Observations of Tempel 1 at the Time of Impact, William M. Jackson and Anita L. Cochran, Deep Impact as a World Observatory Event – Synergies in Space and Time”, ed. Kaufl, H. U. and Sterken, C., Proceedings of the ESO/VUB Conference held in Brussels, Belgium, Springer Berlin, Netherlands, 11-24 (2009).

30. The temporal response of the emissions from Comet 9P/Temple 1 after Deep Impact observed using the Keck Telescope and the HIRES instrument, William M. Jackson, Xiaoyu Shi, XueLiang Yang, and Anita L. Cochran , Ap J., 698, 1609-1619(2009).