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 PbTe(Ga) target ablated by a focused Nd³⁺: YAl-laser (=1.08 m,=15 ns,w=0.47÷4.8 J cm^–2) have been studied using quadrupole mass spectrometry and optical spectrometry. Neutral Pb, Te, Ga, Te₂, and PbTe and singly charged ions of Pb, Te, and Ga were detected by mass spectrometry. The lines of Pb^I, Pb^II, Te^III, and Ga^I were observed in the 340÷760 nm region in the emission spectra; the lines of Pb^III and Te^III were absent. The time-current dependences of ions passed through a mass-filter for each vapor component at differentw and for the generation of the crater on the target surface 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.Submitted as a report at the VI All-Russian Conference on Laser Chemistry, Tuapse, September 18–23, 1993.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 223–226, February, 1994.