The answer to the long-standing quest for better knowledge of material properties originates from the investigation of electromagnetic field interaction with matter. The optical properties of a material are mostly extracted from linear optics. The quest proceeds at nonlinear optical properties linked to the invention of laser and vice versa. The interplay of nonlinear optics and ultrashort laser pulse generation initiated the investigation of the chemical properties of the material at the femtosecond time scale (femto-chemistry). As an example of the ultrafast phenomenon, I present the neutral dissociation of hydrogen molecules in an intense laser field through super-excited states. Strong field physics plays the same role for atto-chemistry as nonlinear optics plays for femto-chemistry. The strong field physics deals with the external electric field having non-negligible strengths compare to binding fields within matter. I will explain how the strong field physics resulted in the generation of attosecond pulses through the three-step model. Attoscience is required to visualize electronic wavepacket dynamics in chemical interactions. I explain how the frequency-matched ionization spectroscopy technique is used to investigate electronic wavepacket. This is the birth of atto-chemistry.

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علاقمندان از طریق لینک
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