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- W775418643 abstract "Pumping a molecule by a femtosecond, pulse to an electronically excited state S 2 creates a vibrational wave packet in this state. Ultrafast internal conversion through a conical intersection may give rise to a periodic motion in a lower potential well, which can be observed as a coherent oscillation in pump-probe spectroscopy. If the slope on entering the well excites the vibration, its assignment gives information on the relaxation or reaction path direction. In the experiment in this chapter the molecules are excited to the S 2 (L a , symmetry 2A) state by a 70 fs pulse at 270 nm. The L a and CT states are just two locations on one potential energy surface (PES), and the L b PES in the form of a conical intersection (CI) crosses this surface. The wave packet passes through the CI and branches there. The one entering first into the S 1 well oscillates there coherently, whereas the other arriving later from the CT state seems to have lost its coherence. The vibration is assigned in PIPBN to amino-group wagging (planarization/pyramidalization) in S 1 ." @default.
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- W775418643 date "2004-01-01" @default.
- W775418643 modified "2023-09-26" @default.
- W775418643 title "Probing of coherent oscillations by multiphoton ionization" @default.
- W775418643 cites W1981931891 @default.
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- W775418643 doi "https://doi.org/10.1016/b978-044451656-5/50061-x" @default.
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