In a large laboratory plasma, reconnection of three-dimensional (3D) magnet
ic fields is studied in the parameter regime of electron magnetohydrodynami
cs (EMHD). The field topologies are spheromak-like with two-dimensional nul
l lines and three-dimensional spiral null points. The relaxation of an init
ial vortex field by spontaneous reconnection is studied in the absence of b
oundary effects, Reconnection rates and energy conversion from fields to pa
rticles are measured. The frozen-in condition appears to be destroyed by vi
scous effects rather than inertia or collision. Finally, the non-driven mer
ging of two EMHD spheromaks into a long-lived FRC is observed. These basic
physics experiments demonstrate that reconnection is an important process i
n the parameter regime of unmagnetized ions, which is always encountered ne
ar absolute magnetic null points.