Time-resolved Stark effect in rapidly varying fields |
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Authors: | RB López-Martens TW Schmidt G Roberts |
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Institution: | (1) University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge CB2 1EW, UK, GB |
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Abstract: | The cycle-averaged ac Stark effect associated with the
A
]2Σ+v′=2?
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]2Π1/2v′=0 two-photon absorption of NO at intensities between 7.7 and 15.2 TW cm-2 has been characterized in real time through a synergic combination of bichromatic laser experiments and quantum-dynamics
calculations. Measurements of the fluorescence emitted by the Rydberg
A
]2Σ+v′=2 level as a function of time between Stark and probe components of a bichromatic field exhibit a characteristic evolution
in temporal peak structure with Stark-field intensity, which is interpreted in terms of a time-dependent Floquet analysis
of the laser–matter interaction. The experimental observations are consistent with a dynamic Stark shift of Δεs(ω1,ω2)≤0.23 eV of the optical transition at these intensities.
Received: 18 January 2002 / Revised version: 6 March 2002 / Published online: 24 April 2002 |
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Keywords: | PACS: 32 60 +i 32 80 Rm 33 80 Rv 42 50 Hz |
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