Acknowledgment. We thank the National Science Foundation (CHE-8114410A3) for support. We thank Dr. Joseph Campana (Naval Research Laboratory, Washing- ton, DC) for access to the ZAB spectrometer. ... Appendix Estimates of AH values were made through use of eq 1 where [M + H]+ represents the protonated molecule, -PAM ... (27) Slayback, JRB; Story, M. S. 2nd. Res. Deu. 1981, February, 129. ... = negative of the proton affinity (PA) of ...