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We present a systematic analysis of two-pion interferometry in Au+Aucollisions at $\sqrt{s_{\rm{NN}}}$ = 62.4 GeV and Cu+Cu collisions at$\sqrt{s_{\rm{NN}}}$ = 62.4 and 200 GeV using the STAR detector at RHIC. Themultiplicity and transverse momentum dependences of the extracted correlationlengths (radii) are studied. The scaling with charged particle multiplicity ofthe apparent system volume at final interaction is studied for the RHIC energydomain. The multiplicity scaling of the measured correlation radii is found tobe independent of colliding system and collision energy.

Pion Interferometry in Au+Au and Cu+Cu Collisions at $\sqrt{s_{\rm{NN}}}$ = 62.4 and 200 GeV