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Electron Production by Associative Detachment of O– Ions with NO, CO, and H2
1.F. C. Fehsenfeld, E. E. Ferguson, and A. L. Schmeltekopf, J. Chem. Phys. 45, 1844 (1966).
1.The rate coefficients shown in Fig. 7 for these authors are recent revisions of the published values supplied by E. E. Ferguson (private communication, August 1967).
2.J. L. Moruzzi and A. V. Phelps, J. Chem. Phys. 45, 4617 (1966);
2.and Bull. Am. Phys. Soc. 11, 733 (1966). The associative detachment rate coefficients given in these references appear to be 25% too high because of nonstandard operation of the highpressure ionization gauge. The points in Fig. 7 corresponding to these data have been lowered accordingly.
3.L. Frommhold, Fortschr. Physik 12, 597 (1964).
4.D. R. Bates and H. S. W. Massey, Trans. Roy. Soc. (London) A239, 269 (1943);
4.and H. S. W. Massey, Negative Ions (Cambridge University Press, Cambridge, England, 1950), p. 88.
5.J. L. Pack and A. V. Phelps, J. Chem. Phys. 44, 1870 (1966);
5.see also 45, 4316 (1966)., J. Chem. Phys.
6.L. B. Loeb, Basic Processes in Gaseous Electronics (University of California Press, Berkeley, California, 1955), Chap. 5.
7.L. M. Chanin, A. V. Phelps, and M. A. Biondi, Phys. Rev. 128, 219 (1962).
8.These lamps are obtained from G. Faust, Exton, Pa.
9.A. V. Phelps and G. J. Schulz, Rev. Sci. Instr. 28, 1051 (1957). The high‐pressure ionization gauge used in the present experiments was calibrated against a McLeod gauge on an auxiliary vacuum system, for each of the three gases used in this study. For the NO calibration an acetone‐ trap was used instead of the conventional liquid‐nitrogen trap to prevent mercury contamination of the system. The filament of the gauge was kept on for the minimum possible time to prevent thermal dissociation of the gas whose pressure was being measured.
10.In the present design the diaphragm used by D. Alpert, C. G. Matland, and A. O. McCoubrey, Rev. Sci. Instr. 22, 370 (1951) is replaced by a bellows in order to eliminate difficulties due to the tendency of the diaphragm to shift suddenly between two stable positions.
11.H. B. Dwight, Tables of Integrals and other Mathematical Data (The MacMillan Co., New York, 1947), p. 181.
12.The term in Eq. (14) was incorrectly written as in Eq. (8) of Ref. 5, although the data were analyzed properly.
13.L. G. H. Huxley, R. W. Crompton, and C. H. Bagot, Australian J. Phys. 12, 303 (1959).
14.G. Wannier, Phys. Rev. 83, 281 (1951);
14.G. Wannier, 89, 795 (1952)., Phys. Rev.
15.D. S. Burch and R. Geballe, Phys. Rev. 106, 183 and (1957). Other studies of formation are discussed in Ref. 2.
16.A. Dalgarno, Ann. Geophys. 17, 16 (1961).
17.J. C. Y. Chen, Phys. Rev. 156, 12 (1967).
18.A. Dalgarno and J. C. Browne, Astrophys. J. 149, 231 (1967). These authors predict a maximum in the rate coefficient for at relative energies of about 0.04 eV.
19.A. Herzenberg, Phys. Rev. 160, 80 (1967).
20.E. W. McDaniel, Collision Phenomena in Ionized Gases (John Wiley & Sons, Inc., New York, 1964), p. 72.
21.Some of the results given for NO in Ref. 2 were obtained using a gas flow system to produce the mixtures. A hot‐filament electron source and suitable electrodes produced a flow of electrons and ions across the gas flow onto an anode containing the entrance aperture of a mass spectrometer.
22.Recent discussions of this subject are T. F. O’Malley, Phys. Rev. 155, 59 (1967),
22.and G. J. Schulz and R. K. Asundi, Phys. Rev. 158, 25 (1967).
23.E. E. Ferguson, F. C. Fehsenfeld, and A. L. Schmeltekopf, J. Chem. Phys. 47, 3085 (1967).
24.F. Kaufman, J. Chem. Phys. 46, 2449 (1967).
25.According to Ref. 1 the rate coefficient for at 300 °K is less than An even lower limit can be obtained from analysis of unpublished measurements by Voshall, Pack, and Phelps of the first‐order associative‐detachment rate coefficient, for An Arrhenius plot of the low‐energy portion of this data yields for 300 °K electrons. Using the equilibrium constant data of refrence 24 we estimate an associative detachement rate coefficient of for where the is in the ground virational state. The production of in higher vibrational states by associative detachment is expect ot be even less likely than producitn of in the ground vibrational stat on hte basis of the potential surface crossing arguments of Ref. 23. Note that the attachment data for and averge electron enegies below about 1.0 eV is consistent with a thired‐order rate coefficient of Furgher studies would be necessary to determine whether this appatrent third‐order attachment process is characteristic of pure or of impurities. Except for the use of higher gas pressures, the conditions for the attachment measurements in are the same as given by J. L. Pack, R. E. Voshall and A. V. Phelps, Phys. Rev. 127, 2084 (1962).
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