Abstract
Abstract The negative ion mass spectra of nitroalkanes (nitromethane, nitroethane, 1-nitropropane and 2-nitropropane) have been mesaured with a mass spectrometer under electron energies of 80 eV, 40 eV, 9.5 eV and 4.5 eV in the range of pressure used for usual analysis. The spectral intensities of negative ions were compared with those of positive ions. In 80 or 40 eV electron impact experiments, m/e 16 (O−), 46 (NO2−), 26 (probably, CN−) and 42 (probably, CNO− or C2H4N−) ions were commonly found. Their yields showed good linearity against pressure under the present experimental conditions. The peaks of m/e 61 (parent ion; CH3NO2−) in nitromethane, of m/e 25 (C2H−) in nitroethane, 1-nitropropane and 2-nitropropane, and a relatively strong peak of m/e 60 (CH2NO2−) in 1-nitropropane were characteristic. For lower electron energies, the strong dependency of the yield of negative ions on the electron energy was confirmed. The yield of negative ions as compared with positive ions for 80 eV and 40 eV of electron energy was lower by a factor of ∼104. On the other hand, the comparison of the yield of positive ions for 15 eV electrons with that of negative ions for 9.5 eV electrons gave the value of ∼0.2. In addition, of the role these negative ions in radiolysis has been briefly discussed.
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