Heats of Formation of Gaseous Free Radicals via Ion Cyclotron Double Resonance Spectroscopy

Journal of the American Chemical Society

Volumn 102, Issue 10, 1980, Pages 3334-3338

  DeFrees, Douglas J ^a   Mclver, Robert T ^a   Hehre, Warren J ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 27644495824     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja00530a005     Document Type: Article

References (28)

1. For some early examples of the application of this technique see: (a) J. L. Beauchamp, Annu. Rev. Phys. Chem., 22, 527 (1971);
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3. J. F. Wolf, R. H. Staley, I. Koppel. M. Taagepera, R. T. Mclver, Jr., J. L. Beauchamp, and R. W. Taft, J. Am. Chem. Soc., 99, 5417 (1977). The published gas-phase basicities need to be slightly modified in view of higher ambient temperatures in the ICR spectrometer than previously believed. The original value of 202.3 kcal mol-1 for the absolute proton affinity of ammonia as derived from ICR spectroscopy has been revised upward by more recent work
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16. Several recent studies12 suggest that the 50 or so Ion-molecule collisions (200 ms at 10-5 Torr) may not be sufficient to thermalize an internally excited ion. However, the agreement of our data with that obtained from independent measurements suggests that processes 8, 9, and 10 combined to cool off the radical cations studied here.
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