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φ mesons were reconstructed in the K + K − channel in Au-Au collisions at √ s NN = 200 GeV by the PHENIX experiment. φ invariant masses were reconstructed using a high resolution time-of-flight detector and electromagnetic calorimeters for particle identification, in conjunction with the excellent momentum resolution of the PHENIX tracking detectors. A description is given of the techniques for signal extraction and the corrections applied to obtain yields.

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Surface dipole barriers for transition metals have been deduced using calculated internal Fermi levels and experimental electron workfunctions. The internal Fermi levels are estimated from a survey of band structure calculations. They have been checked using a theorem which relates the pressure on a solid to the wavefunctions, their derivatives and energies at the Wigner-Seitz cell boundary. This theorem represents a generalization of a relation previously derived using statistical theory, which was used to provide an independent check on internal Fermi levels in simple metals by imposing the equilibrium. zero pressure condition. Reasonable agreement between band structure and pressure cell-boundary estimates for the transition metal internal Fermi level was obtained. The surface dipole barriers range from 02-0.44 Ryd (2.5-6eV). Their large magnitude is a reflection of the large cell boundary electron densities for these metals.