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We present space- and time-resolved experimental data of head-on-merging,supersonic plasma jets (of an argon/impurity mixture) in an initiallycollisionless regime for counter-streaming ions. The merging begins withcollisionless interpenetration followed by a transition to collisionalstagnation. The transition occurs due to an experimentally inferred risingmean-ionization level, which rapidly reduces the counter-streaming ion-ion meanfree path. The measurements demonstrate a specific mechanism by which acollisionless interaction transitions to a collisional one and constraincollisionality and ionization models for plasmas with complex equation ofstate.

Observation of ionization-mediated transition from collisionless interpenetration to collisional stagnation during merging of two supersonic plasmas