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The Mass Spectra of C1–C4 Monodeutero Paraffins
1.C. D. Wagner and D. P. Stevenson, J. Am. Chem. Soc. (to be published).
2.Evans, Bauer, and Beach, J. Chem. Phys. 14, 701 (1946),
3.Turkevich, et al., J. Am. Chem. Soc. 70, 2638 (1948), n‐ and i‐
4.R. E. Honig, Phys. Rev. 75, 1319 (1949).
5.The design and construction of this dc amplifier, which employs Victoreen electrometric tubes (VX‐41) in both the first and second stages, was carried out under the direction of Mr. W. H. Thurston.
6.For a discussion of the measurement of the lives of metastable ions formed by electron impact, see J. A. Hippie, Phys. Rev. 71, 594 (1947).
7.Bleakney, Condon, and Smith, J. Phys. Chem. 41, 197 (1937).
8.D. P. Stevenson, J. Chem. Phys. 15, 409 (1947).
9.N. Bauer and J. Y. Beach, J. Chem. Phys. 15, 150 (1947).
10.G. Herzberg, Atomic Spectra and Atomic Structure (Prentice‐Hall, Inc., New York, 1937), Chapter V.
11.For the temperatures which commonly obtain in mass spectrometer tubes, 75–250 °C, over 50 percent of the paraffin ions formed by electron impact (20‐ to 100‐volt electrons) dissociate; see, for instance, D. P. Stevenson, J. Chem. Phys. 17, 101 (1949). Only 2 percent of the hydrogen molecule‐ions formed by electron impact dissociate, see reference 9.
12.F. L. Mohler and V. H. Dibeler, Phys. Rev. 72, 158 (1947). The results of Mohler and Dibeler have been confirmed in these Laboratories with a Consolidated mass spectrometer, and furthermore there is good agreement between Westinghouse and Consolidated mass spectra (these Laboratories).
13.Qualitative distinction of certain species is possible in some cases as has been noted by Turkevich, et al. (reference 3).
14.For examples of the large variety of species which can arise, see Wagner, Beeck, Otvos, and Stevenson, J. Chem. Phys. 17, 419 (1949), on the reactions of monodeutero paraffins in the presence of an aluminum chloride‐alumina catalyst.
15.J. Delfosse and J. A. Hipple, Phys. Rev. 54, 1060 (1938).
16.We will from this point onward restrict our discussion to the relation between the mass spectra of deutero‐paraffins.
17.J. A. Hipple, Phys. Rev. 53, 530 (1938).
17.D. P. Stevenson and J. A. Hipple, J. Am. Chem. Soc. 64, 1588 (1942).
18.D. P. Stevenson, J. Chem. Phys. 10, 291 (1942).
19.D. P. Stevenson, J. Chem. Phys. 19, 17 (1951).
20.Propane‐2‐d is unique in that the infrared absorption at 13.3–13.7μ permits an absolute upper limit of 4 percent to be set to the contamination by propane‐1‐d. See reference 1.
21.M. B. Koffel and R. A. Lad, J. Chem. Phys. 16, 420 (1948).
21.J. J. Mitchell and F. F. Coleman, J. Chem. Phys. 17, 44 (1949)., J. Chem. Phys.
22.N. D. Coggeshall, J. Chem. Phys. 12, 19 (1944).
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