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Preionization electron density and ion decay measurements in an x‐ray preionized rare‐gas‐fluoride laser
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12.Electron capture, as a deexcitation route, has been neglected explicitly. For electrons that become sufficiently free to usefully contribute to the preionization electron density, electron capture is unlikely. In any case, its effects may be included implicitly in Eq. (1).
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19.This linear variation of signal with externally applied voltage indicates that the potential dropped across any sheath regions that may form close to the electrodes is negligible (the sheath voltage drop is expected to reduce the electric field within the gas by a value almost constant with respect to moderate changes in ). Neglect of any small sheath voltages allows the assumption of a spatially uniform value of E/N, which greatly simplifies the calculation of the ion density from the measured signal.
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25.Emission of photoelectrons from the electrode surface will also contribute to this localized region of high electron number density. If the solid electrode is used as the discharge cathode, this effect may be employed to enhance the preionization electron density close to the cathode. This region is generally starved of preionization electrons because of their drift towards the discharge anode. By using this technique, a small but significant improvement in laser beam quality in the immediate vicinity of cathode has been observed.
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28.Experiments carried out in old gas mixtures that had been subject to repeated laser discharges displayed an initial ion decay rate faster than that predicted by Eq. (3). It seems likely that this increased decay rate, and that observed in the spark preionized laser of Ref. 6, is related to the presence of impurity species.
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