Abstract
AbstractA TEA CO2‐laser induced SF6 + Ba beam‐surface ionization process has been studied when vibrational excitation of SF6 molecules was carried out at (and near) the polished surface of the electrically heated up to 675 K polycristalline Ba. Electron emission and negative molecular ion signal were detected. The dependence of the molecular ion signal on laser fluence and frequency (on SF6 molecular absorption) as well as on the SF6 gas pressure in the nozzle were studied. The results reveal a nonlinear, probably multiphoton character of the molecular ion formation and a clear vibrational selectivity i.e. vibrational enhancement, of the SF6 + Ba beam‐surface ionization process. Possible mechanisms of the negative molecular ion formation in the IR laser induced SF6 + Ba beam‐surface ionization process are discussed.
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