Die bekannten Bilanzgleichungen zur Beschreibung der axialen Entmischung im nichtisothermen SIulenplasma werden durch Beriicksichtigung der radialen Variation der Neutralgastemperatur verallgemeinert und zur Diagnose einer 50-Torr-Argon-Entladung mit Quecksilberdampf-Zusatz ausgenutzt. Die gewonnenen Daten gestatten Riickschliisse auf die Elektronenbeweglichkeit in reinem Argon bei Elektronentemperaturen bis herab zu 9 000 OK.
Chemical microstructures on polymer surfaces are of increasing interest for biological applications. Here, the potential of high-resolution XPS (spatially as well as energetically) was investigated for characterization of these patterns. Chemical modifications obtained on non-patterned samples were compared to chemical contrasts inside the 30-200 µm wide patterns on polystyrene (PS).Chemical contrasts in micro-patterns down to 30 µm could be verified by small-spot XPS and imaging XPS. While features with typical dimensions of some hundred micrometres were reproduced with high contrasts and a chemical composition comparable to non-patterned samples, blurred information was found for spectroscopy as well as imaging of micro-patterns with typical dimensions less than 100 µm.
In a 3.7 MPa electrode-stabilized high-pressure mercury discharge the temperature profile is determined by emission coefficient measurements of the 577 nm mercury line. Values of the net-emission Ue as radiation loss per unit volume are derived assuming the electric field strength decreases with increasing distance from the arc axis. The results can be fitted by an expression of the form ue approximately p exp(-E/kT) where p is the pressure, and E=7.5 eV is an average excitation energy. The numerical value of E is in satisfactory agreement with earlier determinations of this quantity. The model calculations show that there is no significant current dependence of the axis temperature at currents above 1 A but that there is a strong correlation between the axis temperature and the field strength.
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