By J.A.R. Samson and D.L. Ederer (Eds.)

ISBN-10: 0126175608

ISBN-13: 9780126175608

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Extra info for Vacuum Ultraviolet Spectroscopy. Experimental Methods in Physical Sciences

Sample text

1), remembering that for a plane grating R = ~. 57 mm vertically; Eqs. 7/~/mm. Using Eqs. 15 )k or a resolving power of --~660 at 125 eV. 4 Use of Ray Tracing Finally, because in this region of the spectrum the optics are not diffraction limited, the whole system can be checked for its efficiency by using a geometric ray-tracing program such as SHADOW [8], and further optimization carried out. Using these procedures, and the considerable amount of data available on the optical constants for the reflecting materials used in the VUV spectral region [9, 10], it is possible to predict with some certainty the performance of a particular beamline design.

The dielectric barrier can be placed in contact with the HV electrode and the plasma will fill the space FIG. 6. Partial potential energy diagram of Xe with corresponding 1st and 2nd excimer continua. (Reprinted with permission from Appl. Phys. B, Vol. 52, pp. 14-21 (1991), B. Gellert and U. ) 44 GLOW DISCHARGES AND WALL STABILIZED ARCS Fro. 7. Pressure-dependent emission spectra from a dielectric barrier discharge. (Reprinted from Appl. , Vol. 54, pp. 440-444 (1992), H. Esrom and U. ) between the dielectric surface and the ground electrode.

The generator is a typical function generator and the audio amplifier is a unit capable of delivering several watts of output power, for example, 100 W. The highvoltage (HV) transformer in this type of experiment is the output transformer from a HV switching power supply capable of delivering several kilovolts. The dielectric discharge for this experiment was an open-ended, 25-cm-long, Silent discharge FIV X f o r m e r FIG. 5. Schematic of the electrical circuit for a dielectric barrier discharge.

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Vacuum Ultraviolet Spectroscopy. Experimental Methods in Physical Sciences by J.A.R. Samson and D.L. Ederer (Eds.)


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