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Weak-Field Coherent Control of Photodissociation in Polyatomic Molecules

AuthorsGarcía Vela, Alberto
Issue Date3-Oct-2019
AbstractIt has been shown experimentally [1-3] and theoretically [4] for atomic and diatomic systems that when a weak electric field combining two pulses delayed in time is applied, by varying the time delay between the pulses it is possible to modify the shape of the spectral profile associated with the field, which implies to change the relative populations of the different states excited within a superposition. The shape of the profile changes as the delay between pulses is varied due to interference between the pulses. While such a combination of pulses changes the shape of the spectral profile, its bandwidth, which is independent of the delay between the pulses, remains fixed. Thus, the spectral bandwidth of the laser field applied is not modified when the time delay between the pulses is varied. Based on the above interference effect, a weak-field coherent control scheme was proposed for the first time to modify the asymptotic photofragment state distribution of a polyatomic system, Ne-Br2(B,v'), produced upon resonance decay [5,6]. The control scheme applied an electric field consisting of two pulses that overlap spectrally and with a time delay between them. When that time delay is varied, the shape of the corresponding fixed bandwidth spectral profile changes, causing modulation of the initial population of the different resonances populated in a superposition, leading to variation of the asymptotic Br2(B,vf<v') fragment vibrational distribution, and making possible its control. More recently, the scheme has been applied to control the output of photodissociation of the CH3I molecule in the A band [7]. Specifically, control is achieved on different observable quantities associated with the two dissociation channels CH3 + I (2P3/2) and CH3 + I*(2P1/2), such as the final populations in those channels, the branching ratio between them, and the anisotropy parameters associated with the angular distributions produced through both channels.
DescriptionUniversity of Huelva, October 3 - 4 2019. -- Presentación de 9 diapositivas
Appears in Collections:(CFMAC-IFF) Comunicaciones congresos
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