Long Lived Electronic Coherences in Molecules

I will discuss experiments and calculations that demonstrate long lived electronic coherences in molecules using a combination of measurements with shaped ultrafast pulses, 3D velocity map imaging and calculations of the light matter interaction. Our pump-probe measurements, making use of laser pulses in the infrared and deep ultraviolet, prepare and interrogate entangled nuclear-electronic wave packets whose electronic phase remains well defined despite vibrational motion along many degrees of freedom. The experiments and calculations illustrate when and how coherences between different electronic states survive, and may have important implications for light harvesting, electronic transport and attosecond science.