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The Use of a Multichannel Scaler in Electron Attachment‐Detachment Experiments
1.For a substantial list of references see Refs. 1–18 given by Chanin et al..5
2.A. Doehring, Z. Naturforsch. 7a, 253 (1952).
3.L. B. Loeb, Basic Process in Gaseous Electronics (University of California Press, Berkeley, California, 1955), Chap. 5.
4.J. L. Pack and A. V. Phelps, J. Chem. Phys. 44, 1870 (1966).
5.L. M. Chanin, A. V. Phelps, and M. A. Biondi, Phys. Rev. 128, 219 (1962).
6.The choice of amplifier is dictated by the experimental parameters used. The low frequency response is determined by the rate at which the system is triggered while the required risetime of the detection system will govern the high frequency response. In these experiments, where ion transit times of 0.5‐50 msec were studied, a good frequency response between 1 cps and 40 kc was adequate. The amplifier used was a Tektronix 122 and the input resistor R was 2 MΩ.
7.R. R. Ernst, Rev. Sci. Instrum. 36, 1689 (1965).
8.R. R. Ernst and W. A. Anderson, Rev. Instrum. 36, 1696 (1965).
9.It was found that good electron collection was achieved when the rf voltage applied to the grid wires was such that the average E/p between adjacent grid wires was approximately equal to the E/p applied to the drift space. See Ref. 11 for further discussion of the requirements.
10.The MCS used, T.M.C. model 400 C, could be switched between the add and subtract modes by applying a pulse to the memory logic.
11.J. L. Moruzzi, J. W. Ekin, Jr., and A. V. Phelps, J. Chem. Phys. 48, 3070 (1968).
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