FEMTOSECOND ENERGY- AND ANGLE-RESOLVED PHOTOELECTRON SPECTRA Yasuki Arasaki, Kazuo Takatsuka, Kwanghsi Wang, and Vincent McKoy Department of Basic Science, Graduate School of Arts and Sciences, University of Tokyo, Japan Laboratory for Molecular Sciences. California Institute of Technology, Pasadena, California We present energy- and angle-resolved photoelectron spectra for femtosecond pump-probe ionization of wavepackets in the double-minimum excited state of the sodium dimer molecule. These results illustrate that a robust description of the underlying photoionization amplitudes can significantly enhance the utility of photoelectron spectroscopy as a probe of wavepacket motion. Abstract and Related Information