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Non-adiabatic molecular association in thermal gases driven by radio-frequency pulses

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arxiv 1903.01389 v2 pith:2BOC5QVS submitted 2019-03-04 physics.atom-ph quant-ph

classification physics.atom-phquant-ph
keywords molecularradio-frequencythermalassociationenvelopeexhibitsinterferencepulse
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abstract

The molecular association process in a thermal gas of $^{85}$Rb is investigated where the effects of the envelope of the radio-frequency field are taken into account. For experimentally relevant parameters our analysis shows that with increasing pulse length the corresponding molecular conversion efficiency exhibits low-frequency interference fringes which are robust under thermal averaging over a wide range of temperatures. This dynamical interference phenomenon is attributed to St\"uckelberg phase accumulation between the low-energy continuum states and the dressed molecular state which exhibits a shift proportional to the envelope of the radio-frequency pulse intensity.

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