Photochemical Reactions in the Gas Phase Studied by Ultrafast Electron Diffraction
摘要
Time-resolved ultrafast electron diffraction (UED) from isolated molecules allows insight into ultrafast quantum wavepacket dynamics of molecules with sub-Angstrom spatial resolution. For the simple example of an excited state vibrational wavepacket in iodine, we can reconstruct the mean atomic distance as a function of delay after the optical excitation. For the case of CF3I, we can reconstruct the dissociative motion after UV excitation on the A-band states. Furthermore, we also show how the signature of nonadiabatic wavepacket dynamics after two-photon excitation is visible in the diffraction data.