FIZIKA A 7 (1998) 1, 37-48

SPECTROSCOPIC PROPERTIES OF THE Li, Zn METALS AND Li-Zn ALLOY PLASMAS GENERATED BY XeCl-LASER ABLATION

SREKO GOGIĆ AND SLOBODAN MILOŠEVIĆ

Institute of Physics, P.O. Box 304, HR-10000 Zagreb, Croatia
e-mail: slobodan@ifs.hr, Fax: 00 385 1 4680 399

Received 23 December 1997; revised manuscript received 30 April 1998;Accepted 26 May 1998

Using 308 nm laser ablation, we have produced lithium, zinc and lithium-zinc plasmas and have studied their spectral, temporal and spatial characteristics. In pure lithium plume, linear Stark effect is observed in n ²D-2²P transitions (n = 3,4,5,6) up to 0.3 ms after the laser pulse. In pure zinc plume, both atomic and ionic spectral lines are observed. Time evolution of spectral line intensities suggests that the mechanism responsible for population of atomic zinc states is a cascade of ion-electron recombination processes. The ablation of Li-Zn alloy shows much faster decay of Zn spectral features than of Li spectral lines. Therefore, the decomposition of plume into shells of different colours is observable.

PACS number: 52.50.Jm
UDC 537.53

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