S. Amoruso et al., TIME-OF-FLIGHT MASS-SPECTROMETRY AND COVARIANCE MAPPING TECHNIQUE INVESTIGATION OF CHARGED SPECIES EVOLUTION IN PB(TI0.48ZR0.52)O-3 LASER-ABLATION, Applied surface science, 86(1-4), 1995, pp. 35-39
Citations number
9
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical","Materials Science, Coatings & Films
Time of night mass spectrometry and covariance mapping technique have
been used to investigate the formation of charged species in the laser
ablation of Pb(Ti0.48Zr0.52)O-3 (PZT) targets. The mass spectral anal
ysis has been carried out as a function of distance h from the target,
both in high vacuum condition (10(-7) mbar) and in oxygen environment
(0.2 mbar background pressure). The relative abundance of atomic, mon
oxide and heavy ions has been measured and discussed. In high vacuum c
ondition the relative abundance of heavy ions is a decreasing function
of the distance from the target and becomes very low, about 8%, at th
e deposition distances. On the contrary, the relative abundance of mon
atomic ions and simple oxides increases with the distance from the tar
get. In oxygen environment the relative abundance of heavy ions does n
ot show a monotonic trend. This is likely due to the contemporary pres
ence of fragmentation and aggregation processes. However, at the depos
ition distance a significant part of the plume, about 40%, is composed
of large aggregates containing Pb. Moreover, the covariance mapping a
nalysis shows that the light species are mainly produced by dissociati
on of the heavy aggregates.