Laser manipulation to create new states

Weak electromagnetic fields created by stationary laser fields (continuous-wave laser) can efficiently excite or deexcite a state to another only when 

Chemical Theory Beyond the Born-Oppenheimer Paradigm 

Control of molecular orientation and/or alignement in space has been proposed and extensively studied by Seideman, in which she designs to creat a coherent standing wavepacket for rotational motion in terms of a non-resonant laser field [386]. 

2 Control of electronic states with attosecond and/or intense laser fields 

As a fundamental study on field induced chemical reactions, Neidel and Vrakking et al. observed attosecond d3mamics of electrons in a series of small- and medium sized neutral molecules by monitoring time-dependent variation of the parent molecular ion 3delds [296]. The information on electron dynamics was extracted from experimental data on the basis of the relation between the time dependent dipole and ionization. This was performed in the two-color femtosecond near infrared (NIR) pump-attosecond extreme ultraviolet (XUV) probe experiment. They claim that the time-dependent dipole induced by the moderately strong NIR pulse field is monitored with attosecond time resolution. The oscillations are interpreted in terms of a time dependent screening induced by the polarization of the molecule, which alters the photoionization yield of the neutral molecule. This scheme can be considered as the first example of molecular attosecond Stark spectroscopy. 

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