A modified SCRAP technique using the decelerator's time-varying dc electric field as the chirp can achieve >99.5% population inversion between weak-field- and strong-field-seeking states of ammonia, improving Stark deceleration efficiency.
Theory of long-range ultracold atom-molecule photoassociation
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abstract
The creation of ultracold molecules is currently limited to diatomic species. In this letter we present a theoretical description of the photoassociation of ultracold atoms and molecules to create ultracold excited triatomic molecules, thus being a novel example of light-assisted ultracold chemical reaction. The calculation of the photoassociation rate of ultracold Cs atoms with ultracold Cs$_2$ molecules in their rovibrational ground state is reported, based on the solution of the quantum dynamics involving the atom-molecule long-range interactions, and assuming a model potential for the short-range physics. The rate for the formation of excited Cs$_3$ molecules is predicted to be comparable with currently observed atom-atom photoassociation rates. We formulate an experimental proposal to observe this process relying on the available techniques of optical lattices and standard photoassociation spectroscopy.
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Controlling rovibrational state populations of polar molecules in inhomogeneous electric fields of the Stark deceleration: molecular dynamics and quantum chemistry simulations
A modified SCRAP technique using the decelerator's time-varying dc electric field as the chirp can achieve >99.5% population inversion between weak-field- and strong-field-seeking states of ammonia, improving Stark deceleration efficiency.