  Solar type III radio bursts are generated by beams of energetic electrons
that travel along open magnetic field lines through the corona and into
interplanetary space. However, understanding the source of these electrons and
how they escape into interplanetary space remains an outstanding topic. Here we
report multi-instrument, multi-perspective observations of an interplanetary
type III radio burst event shortly after the second perihelion of the Parker
Solar Probe (PSP). This event was associated with a solar jet that produced an
impulsive microwave burst event recorded by the Expanded Owens Valley Solar
Array (EOVSA). The type III burst event also coincided with the detection of
enhanced in situ energetic electrons recorded by both PSP at 0.37 AU and WIND
at 1 AU, which were located very closely on the Parker spiral longitudinally.
The close timing association and magnetic connectivity suggest that the in situ
energetic electrons originated from the jet's magnetic reconnection region.
Intriguingly, microwave imaging spectroscopy results suggest that the escaping
energetic electrons were injected into a large opening angle of about 90
degrees, which is at least nine times broader than the apparent width of the
jet spire. Our findings provide an interpretation for the previously reported,
longitudinally broad spatial distribution of flare locations associated with
prompt energetic electron events and have important implications for
understanding the origin and distribution of energetic electrons in the
interplanetary space.
