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Ablation of single-crystalline cesium iodide by extreme ultraviolet capillary-discharge laser

Wild Jan, Pira Peter, Burian Tomas, Vysin Ludek, Juha Libor, Zelinger Zdenek, Danis Stanislav, Nehasil Vaclav, Rafaj Zdenek, Nevrly Vaclav, Dostal Michal, Bitala Petr, Kudrna Pavel, Tichy Milan, Rocca Jorge J.

Nukleonika

2020

Vol. 65, No. 4

205--210

Extreme ultraviolet (XUV) capillary-discharge lasers (CDLs) are a suitable source for the efficient, clean ablation of ionic crystals, which are obviously difficult to ablate with conventional, long-wavelength lasers. In the present study, a single crystal of cesium iodide (CsI) was irradiated by multiple, focused 1.5-ns pulses of 46.9-nm radiation delivered from a compact XUV-CDL device operated at either 2-Hz or 3-Hz repetition rates. The ablation rates were determined from the depth of the craters produced by the accumulation of laser pulses. Langmuir probes were used to diagnose the plasma plume produced by the focused XUV-CDL beam. Both the electron density and electron temperature were sufficiently high to confirm that ablation was the key process in the observed CsI removal. Moreover, a CsI thin film on MgO substrate was prepared by XUV pulsed laser deposition; a fraction of the film was detected by X-ray photoelectron spectroscopy.

Testing the efficiency of the Si3N4 membranes for charged particles registration

Polak W., Lekki J., Gryboś J., Hajduk R., Cholewa M., Kukharenko O., Stachura Z.

Nukleonika

2003

Vol. 48, nr 1

25-29

Testing Si3N4 membrane windows is a preliminary research for the single-ion-single-cell irradiating programme prepared at the Cracow nuclear microprobe facility. The present investigation is concerned with finding a method to register every single particle of the microprobe beam when passing through a membrane to the atmosphere. The 200 nm thick membranes covered with different layers were investigated. The alpha particles, after passing the membrane window, were registered by a particle detector. Secondary electrons ejected from the membrane by alpha particles were registered by a channeltron. The channeltron signals were collected in coincidence with the silicon detector signals. The detection efficiency is the ratio of the fast coincident channeltron signal number to the total number of the silicon detector signals. The results of investigation of the membranes with different coverages are reported in the present work.