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- W2064369488 abstract "Large variations are observed in the chemi-ionization cross sections for the thermal reactions of Ca, Sr, Ba, and Yb atoms with various halogen and interhalogen molecules, as well as chlorine dioxide. While the alkaline earth metal atom reactions generally produce ion products, this is only true for Yb + F2. The absence of ions for the other Yb reaction is explained on energetic grounds. For the reaction of a metal atom (M) with a halogen (X2), the positive and negative ions are determined mass spectrometrically to be MX+ and X−. For the interhalogens, both ion channels, MX+ + Y− and MY+ + X, are observed, the dominant channel being the one more exoergic. Absolute chemi-ionization cross sections are estimated to range from 0.001 to 1.6 A2, with an uncertainty of ± 100%. These cross sections decrease in the order BA > Sr Ca > Yb for all oxidizer gases other than F2. For a given alkaline earth metal, the cross sections decrease in the order F2 > Cl2 > I2, the only exception being Ba + F2. These large cross sections indicate that for all the reactions discussed here, the chemi-ionization channel is much more important than the chemiluminescence pathway." @default.
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- W2064369488 date "1977-03-01" @default.
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- W2064369488 title "Chemi-ionization reactions of Ca, Sr, Ba, and Yb atoms with the halogen and interhalogen molecules" @default.
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- W2064369488 doi "https://doi.org/10.1016/0301-0104(77)85031-3" @default.
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