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We report ALMA observations of a one-sided, high-velocity ($\sim$80 kms$^{-1}$) CO($J = 2 \rightarrow 1$) jet powered by the intermediate-massprotostellar source Serpens SMM1-a. The highly collimated molecular jet isflanked at the base by a wide-angle cavity; the walls of the cavity can be seenin both 4 cm free-free emission detected by the VLA and 1.3 mm thermal dustemission detected by ALMA. This is the first time that ionization of an outflowcavity has been directly detected via free-free emission in a very young,embedded Class 0 protostellar source that is still powering a molecular jet.The cavity walls are ionized either by UV photons escaping from the accretingprotostellar source, or by the precessing molecular jet impacting the walls.These observations suggest that ionized outflow cavities may be common in Class0 protostellar sources, shedding further light on the radiation, outflow, andjet environments in the youngest, most embedded forming stars.

An extremely high velocity molecular jet surrounded by an ionized cavity in the protostellar source Serpens SMM1