Publication Date:
2014-10-28
Description:
We theoretically investigated the improvement on the production rate of the decelerated bromine (Br) atoms near zero speed by photodissociating laser aligned Br 2 precursors. Adiabatic alignment of Br 2 precursors exposed to long laser pulses with duration on the order of nanoseconds was investigated by solving the time-dependent Schrödinger equation. The dynamical fragmentation of adiabatically aligned Br 2 precursors was simulated and velocity distribution of the Br atoms produced was analyzed. Our study shows that the larger the degree of the precursor alignment, ⟨cos 2 θ⟩, the higher the production rate of the decelerated Br atoms near zero speed. For Br 2 molecules with an initial rotational temperature of ∼1 K, a ⟨cos 2 θ⟩ value of ∼0.88 can result in an improvement factor of over ∼20 on the production rate of the decelerated Br atoms near zero speed, requiring a laser intensity of only ∼1 × 10 12 W/cm 2 for alignment.
Print ISSN:
0021-9606
Electronic ISSN:
1089-7690
Topics:
Chemistry and Pharmacology
,
Physics
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