A K-x-ray band up to the united-atom limit for Z-lO has been observed in 30-and 60-MeV Br + Br collisions. This band can be assigned unambiguously to transitions between molecular orbitals. With a KBr target, yields at the two energies are (for Ey.^22 keV) 2 X 10"^ and 10"^ photons/projectile, respectively, or 10"'^ photon s/be am ii vacancy, nearly independent of beam energy. Much reduced yields are found for Ti, Fe, and Zr targets.
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