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Oscillations in Reflectivity of Samples with X-ray Waveguide Layers

100%

Pełka J., Lagomarsino S., Di Fonzo S., Jark W., Domagała J.

Acta Physica Polonica A

1996

vol. 89

issue 3

323-328

The glancing-angle reflectivity profiles in samples containing an X-ray waveguide layer are studied. Oscillations observed at angles within the region of resonance and above, are interpreted by angle dependent interference of the monochromatic X-ray beam in thin layer. The discussion is extended to the structures composed of more than one layer. Experimental reflectivity spectra recorded with Cu K_{α} radiation are compared with the theoretical calculations. It leads to the model of oscillations in reflectivity consistent both for the resonant and non-resonant regions, and clarifies interpretation of oscillations in the region above the resonances. A brief discussion of potential applications of the reflectivity spectra to the studies of structure of thin layers is done.

Study of Photoelectron Emission Yield from Layered Structures in Presence of Resonance-Enhanced X-Ray Propagation Effect

100%

Pełka J. B., Lagomarsino S., Cedola A., Di Fonzo S., Jark W.

Acta Physica Polonica A

1997

vol. 91

issue 5

851-857

In this work we present the new experimental results of total photoelectric yield as well as energy distribution of photoelectrons excited in a thin carbon film deposited on Ni mirror in the presence of resonance-enhanced X-ray propagation effect. The measurements were performed using conventional X-ray tube as a radiation source for the energy Cu K_{α} (8047 keV). The spectra were recorded using a flow proportional electron counter with energy resolution of about 15%, and multichannel pulse height analyzer. A comparison with the reflectivity spectra recorded at the same time show an excellent correlation of both kinds of spectra, consistently with the theoretical prediction. A map of electron energy distribution is reported. Although the applied electron counter was of low energetic resolution the recorded spectra show characteristic regularities and indicate that the photoelectron yield excited in the presence of resonance-enhanced X-ray propagation effect can provide depth dependent information about impurity distribution and processes in thin layers.

Ultrabright Synchrotron Source ELETTRA: First Period of Operation

59%

Margaritondo G., Savoia A., Bernstoff S., Bertolo M., Comelli G., De Bona F., Jark W., Kiskinova M., Paolucci G., Prince K., Santaniello A., Tromba G., Walker R., Rosei R.

Acta Physica Polonica A

1997

vol. 91

issue 4

631-640

ELETTRA, the brightest source of soft-X-ray in Europe and one of the two brightest in the world, is officially operating as a user facility since the summer of 1995. The source and the operating beam lines have reached and surpassed the design performances. The impact of such performances is already felt in experiments: new applications are possible which were very difficult or quite impossible with the previous generation of sources. We present a few specific results to illustrate this point, and some considerations on the future development of the facility - primarily in view of its large and rapidly growing international use.

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3 Acta Physica Polonica A

2 1997

1 1996

3 Jark W.

2 Di Fonzo S.

2 Lagomarsino S.

1 Bernstoff S.

1 Bertolo M.

1 Cedola A.

1 Comelli G.

1 De Bona F.

1 Domagała J.

1 Kiskinova M.

1 Margaritondo G.

1 Paolucci G.

1 Pełka J.

1 Pełka J. B.

1 Prince K.

1 Rosei R.

1 Santaniello A.

1 Savoia A.

1 Tromba G.

1 Walker R.

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Oscillations in Reflectivity of Samples with X-ray Waveguide Layers

Study of Photoelectron Emission Yield from Layered Structures in Presence of Resonance-Enhanced X-Ray Propagation Effect

Ultrabright Synchrotron Source ELETTRA: First Period of Operation