Molecular Orbital Tomography and High Harmonic Spectroscopy

Abstract

Recent progress of intense ultrafast laser technology gave birth to non-purturbative nonlinear optics. Indeed non-purturbative nonlinear optics has grown along the progress of high-order harmonic generation and its understanding, where the coherence of electron wavepackets and strong optical fi elds play the key roles. Today, high harmonics have become indispensable tools for attosecond science. In addition, novel application of high harmonic generation has emerged where tunneled electron wavepackets are used to probe the electronic structures and their dynamics of gas-phase molecules. Such methods are now called high harmonic spectroscopy. As an example of high harmonic spectroscopy, the principle of molecular orbital tomography is discussed and the relevant achievements are reviewed. Key