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The Sunyaev-Zel'dovich (SZ) effect spectrum crosses through a null wheredT_CMB = 0 near nu_0 = 217 GHz. In a cluster of galaxies, nu_0 can be shiftedfrom the canonical thermal SZ effect value by corrections to the SZ effectscattering due to the properties of the inter-cluster medium. We have measuredthe SZ effect in the hot galaxy cluster RX J1347.5-1145 with Z-Spec, an R ~ 300grating spectrometer sensitive between 185 and 305 GHz. These data comprise ahigh spectral resolution measurement around the null of the SZ effect andclearly exhibit the transition from negative to positive dT_CMB over the Z-Specband. The SZ null position is measured to be nu_0 = 225.8 \pm 2.5 (stat.) \pm1.2 (sys.) GHz, which differs from the canonical null frequency by 3.0 sigmaand is evidence for modifications to the canonical thermal SZ effect shape.Assuming the measured shift in nu_0 is due only to relativistic corrections tothe SZ spectrum, we place the limit T_e = 17.1 \pm 5.3 keV from the zero-pointmeasurement alone. By simulating the response of the instrument to the sky, weare able to generate likelihood functions in {y_0, T_e, v_pec} space. For v_pec= 0 km/s, we measure the best fitting SZ model to be y_0 = 4.6 (+0.6, -0.9) x10^-4, T_e,0 = 15.2 (+12,-7.4) keV. When v_pec is allowed to vary, a mostprobable value of v_pec = +450 \pm 810 km/s is found.

High Spectral Resolution Measurement of the Sunyaev-Zel'dovich Effect Null with Z-Spec