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We report the detection of atomic chlorine emissions in the atmosphere of Iousing Hubble Space Telescope observations with the Goddard High ResolutionSpectrograph (GHRS). The Cl I 1349 A dipole allowed and Cl I] 1386 A forbiddentransition multiplets are detected at a signal to noise ratio (SNR) of 6 and10, respectively, in a combined GHRS spectrum acquired from 1994 through 1996.Oxygen and sulfur emissions are simultaneously detected with the chlorine whichallows for self-consistent abundance ratios of chlorine to these otheratmospheric species. The disk averaged ratios are: Cl/O = 0.017 +/- 0.008, Cl/S= 0.10 +/- 0.05, and S/O = 0.18 +/- 0.08. We also derive a geometric albedo of1.0 +/- 0.4 % for Io at 1335 A assuming an SO2 atmospheric column density of1x10^{16} cm^{-2}.Comment: 23 pages, 5 figures, accepted for publication in ApJ, August 1, 200

Detection of Atomic Chlorine in Io’s Atmosphere with theHubble Space TelescopeGHRS