The B_c meson is the bound state of b\bar {c} (or \bar {b}c) whose recent detection is the first step toward completion of the spectroscopy of heavy quark mesonic states. The b-c states have properties that conveniently fill the gap between the J/\psi and the {\Upsilon } states. Thus it is probable that at RHIC the B_c mesons will serve as a probe of deconfined matter. We find that significant differences arise for B_c formation in deconfined and confined matter. Our initial calculations suggest that:

PACS numbers: 12.38.Mh, 25.75.--q, 14.40.Nd