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Excitation and Negative Ions in H2O
1.G. J. Schulz, Phys. Rev. 112, 150 (1958).
2.R. E. Fox, W. M. Hickam, D. J. Grove, and T. Kjeldaas, Rev. Sci. Instr. 26, 1101 (1955). See also footnote reference 1. The total width of the electron energy distribution, using freshly gold plated electrodes is of the order of 0.1 ev. However, the width slowly broadens as the electrodes are exposed to After about 50 hr of operation in the width deteriorates to about 0.5 ev.
3.G. J. Schulz, Phys. Rev. 116, 1141 (1959).
4.For processes in which all the electrons in the distribution are involved, the peak of the electron distribution is usually taken as a reference for the electron energy scale. For processes which depend only on the high‐energy portion of the electron distribution (as is the case for a threshold process), the high‐energy cutoff of the distribution is taken as the reference.
5.G. J. Schulz (to be published).
6.The design of the low‐noise preamplifier is identical to that used by D. S. Burch and S. Smith, at the National Bureau of Standards (private communication).
7.W. W. Lozier, Phys. Rev. 36, 1417 (1930).
8.M. M. Mann, A. Hustrulid, and J. T. Tate, Phys. Rev. 58, 340 (1940).
9.C. E. Berry, Phys. Rev. 78, 597 (1950). The kinetic energy of at an electron energy of 8.9 ev is 4.2 ev; whereas the kinetic energy of the at 8.9 ev is of the order of 0.2 ev assuming the process postulated in footnote reference 8. Because of the high kinetic energy of the the production of is strongly underestimated in a mass spectrometer.
10.I. S. Buchelnikova, Zhur. Eksptl. i Teoret. Fiz. 35, 1119 (1958),
10.translation, I. S. Buchelnikova, Soviet Phys. JETP 35, 783 (1959).
11.W. W. Lozier, Phys. Rev. 46, 268 (1934).
12.When determining the energy at which a peak of a curve occurs, the energy scale is usually obtained from the peak of the electron distribution.
13.K. J. Laidler, J. Chem. Phys. 22, 1740 (1954).
14.K. E. Schuler, J. Chem. Phys. 21, 624 (1953).
15.The negative ion current arriving at the collector is independent of the drawout voltage in the range 0 to 10 v. At higher voltages, the trapped‐electron current adds to the negative ion current and makes an independent determination of the negative ions impossible. It is assumed that the negative ion current remains independent of drawout potential beyond 10 v.
16.H. D. Hagstrum and J. T. Tate, Phys. Rev. 59, 354 (1941).
17.K. Watanabe and M. Zelikoff, J. Opt. Soc. Am. 43, 753 (1953).
18.F. H. Field and J. L. Franklin, Electron Impact Phenomena and the Properties of Gaseous Ions (Academic Press, Inc., New York, 1957), p. 280.
19.W. C. Price and T. M. Sugden, Trans. Faraday Soc. 44, 108 (1948).
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