Investigations on Ultrafast Atomic and Molecular Dynamics with Harmonic Sources

Abstract

High harmonic light sources with attosecond duration in the EUV and soft X-ray spectral range can be applied to probe ultrafast dynamics of atoms and molecules. By tuning harmonic wavelength, He atoms can be excited to the 1s3p state that can be further ionized by a time-delayed infrared femtosecond laser pulse. The interference, between the directly photoionized electron and that from the excited state, was used to reconstruct the amplitude and phase of electron wavepacket from the 1s3p state, probing ultrafast photoionization dynamics of He. In addition, molecular high harmonic radiation, generated from multiple molecular orbitals, is investigated for molecular structural information. In order to resolve harmonic radiation from multiple orbitals of CO