REFERENCES
1.
2.
(a)
J. D.
Morrison
and J. C.
Traeger
, J. Chem. Phys.
53
, 4053
(1970
).(b) Dr. Morrison assures me he gets similar curves on 180°, 60° sector and quadrupole instruments. The operating conditions and details of the electron impact source remain not given.
3.
4.
5.
6.
7.
8.
There is no single mass‐analyzed ionization efficiency curve for any substance which has been demonstrated to be an accurate representation of the ionization cross section. Slight variations in electron beam diameter and position, space‐charge potential, and in focussing characteristics can cause large changes in collection efficiency of ions vs electron energy. No two laboratories in the country get the same shape for vs energy. The experiments of Refs. 5, 6, 7, and 9 seem to suffer least from these errors. In unpublished work with the total collection mass spectrometer [
J. Chem. Phys.
42
, 3201
(1965
), Appendix II] this author obtained an curve close to that of Bleakney,5 in strong disagreement with Fig. 1 of Ref. 2.9.
10.
11.
H. Harrison, Ph.D. thesis, Catholic University of America, Washington, D.C., 1956.
12.
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© 1971 The American Institute of Physics.
1971
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