The relative gas-phase acidities of 81 oxygen, nitrogen, carbon, sulfur, and phosphorus acids have been measured at 320 K with a pulsed ion cyclotron resonance spectrometer. Equilibrium constants for reactions of the general type A-+ BH = B" + AH are used to determine the relative acidities of the two acids AH and BH in the absence of solvation. The experimental data are also used to calculate gaseous heats of formation for a wide variety of anions, electron affinities of radicals, EA (A•), and bond dissociation energies, DH°(A-H). Criteria for the establishment of equilibrium in pulsed ICR experiments are discussed.

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havior is believed to be general for this class of intermediates.Acknowledgment. We are grateful to Kevin Peters and Erin O'Driscoll (University of Colorado) for their help in obtaining the picosecond spectra, to the University of Arkansas for a sabbatical leave, and to T. J. Meyer (University of North Carolina) for the use of his nanosecond equipment. We thank E. M. Arnett (Duke University) and R. A. McClelland (Toronto) for their thoughtful comments and suggestions. We appreciate the com-ments of a referee who made a number of valuable suggestions concerning our picosecond data.

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