MASS-SPECTROMETRIC AND OPTICAL STUDY OF PRODUCTS FROM LASER-ABLATED PBTE(GA)

The products of evaporation (p = 10(-7) Torr) from the surface of a Pb Te(Ga) target ablated by a focused Nd3+: YAl-laser(lambda = 1.08 mu m, tau = 15 ns, w = 0.47 divided by 4.8 J cm(-2)) have been studied usin g quadrupole mass spectrometry and optical spectrometry. Neutral Pb, T e, Ga, Te-2, and PbTe and singly charged ions of Pb, Te, and Ga were d etected by mass spectrometry. The lines of Pb-I, Pb-II, Te-II, and Ga- I were observed in the 340 divided by 760 nm region in the emission sp ectra; the lines of Pb-III and Te-III were absent. The time-current de pendences of ions passed through a mass-filter for each vapor componen t at different w and for the generation of the crater on the target su rface were studied. The kinetic energy of the ions was estimated using an ion-optical decelerating lens. The temperature of the laser plasma was estimated from the intensities of the Pb-I lines.