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Article Dans Une Revue Physical Review Letters Année : 2015

Orientation and Alignment Echoes

Résumé

We present one of the simplest classical system featuring the echo phenomenon-a collection of randomly oriented free rotors with dispersed rotational velocities. Following excitation by a pair of time-delayed impulsive kicks, the mean orientation/alignment of the ensemble exhibits multiple echoes and fractional echoes. We elucidate the mechanism of the echo formation by kick-induced filamentation of phase space, and provide the first experimental demonstration of classical alignment echoes in a thermal gas of CO2 molecules excited by a pair of femtosecond laser pulses.
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Dates et versions

hal-02398531 , version 1 (07-12-2019)

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G. Karras, E. Hertz, F. Billard, B. Lavorel, J.-M. Hartmann, et al.. Orientation and Alignment Echoes. Physical Review Letters, 2015, 114 (15), ⟨10.1103/PhysRevLett.114.153601⟩. ⟨hal-02398531⟩
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