Corrections: Chemical Ionization in Fourier Transform Mass Spectrometry: (Anal. Chem. (1981) 53(3) (428-437) (10.1021/ac00226a011))

There is an error on page 432, second paragraph. The pressure of CO was estimated to be 1 X 10⁻⁹ torr based on analysis of the methane sample using a Kratos MS-50 double focusing mass spectrometer. Calculation of Pco using the data in Figure 5, however, indicates that Pco should be about 1 × 10⁻⁷ torr. The discrepancy is probably due to the formation of CO from methane and trace amounts of water in the ion pump. The same phenomenon manifests itself for the cyclo hexanone Cl experiment discussed in the fourth paragraph, page 432. The fast consumption of CH⁵⁺ was partially due to protonation of CO. The CHO+ (unresolved from C₂H₅₊) contributed to the m/z 29 peak intensity reported in Table IV.