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Kelly Gaffney

Kelly Gaffney

Associate Professor of Photon Science and, by courtesy, of Chemistry
Experimental condensed phase physical chemistry and chemical physics.


Professor Gaffney leads a research team focused on femtosecond resolution measurements of chemical dynamics in complex condensed phase systems. This research takes advantage of recent advances in ultrafast x-ray lasers, like the LCLS at SLAC National Accelerator Laboratory, to directly observe chemical reactions on the natural time and length scales of the chemical bond – femtoseconds and Ångströms. This research focuses on the discovery of design principles for controlling the non-equilibrium dynamics of electronic excited states and using these principles to spark new approaches to light-driven catalysis in chemical synthesis.

This research builds on Professor Gaffney’s extensive experience with ultrafast optical laser science and technology. This work began with time- and angle- resolved two photon photoemission studies of electron solvation and localization at interfaces as a graduate student working with Professor Charles Harris at the University of California at Berkeley and extended to multidimensional vibrational spectroscopy studies of hydrogen bonding and ion solvation dynamics in solution during postdoctoral studies with Professor Michael Fayer at Stanford and as an Assistant Professor. The transition to ultrafast x-ray science began in 2004 at SLAC, where he helped establish the first chemical dynamics research program at SLAC.


Associate Professor, Photon Science Directorate
Associate Professor (By courtesy), Chemistry

Other Appointments

Department chair, Photon Science Department (2020 - Present)
Chemical Sciences Division Director, Energy Sciences Directorate, SLAC National Accelerator Laboratory (2019 - Present)
Associate Laboratory Director, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory (2014 - 2019)
Principle Investigator, PULSE Institute (2007 - Present)

Professional Education

PhD, University of California at Berkeley, Chemistry (2001)

Featured Publications