Numéro
J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
Page(s) C4-201 - C4-203
DOI http://dx.doi.org/10.1051/jp4:1993428
4th International Workshop on Positron and Positronium Chemistry

J. Phys. IV France 03 (1993) C4-201-C4-203

DOI: 10.1051/jp4:1993428

Positron annihilation studies in binary solid solutions of metal betadiketonates, using lifetime and Doppler broadening spectroscopies

J.C. MACHADO, A.O. PORTO, C.F. CARVALHO, W.F. MAGALHAES and A. MARQUES-NETTO

Departamento de Química, ICEx, UFMG, C.P. 702, 31270 901 Belo Horizonte M.G., Brazil


Abstract
Positron annihilation lifetime (LS) and Doppler broadening annihilation radiation lineshape (DBARL) spectroscopies measurements were performed in several binary solid solutions of the general formula M(1-x)G(x)L3 where M = Al (III), Ga (III), or In (III), as matrix ; G = Cr (III), Mn (III), Fe (III), Co (III), Ru (III), Rh (III), and Ir (III), as guest molecules, L = acetylacetone (acac) or dipivaloylmethane (dpm), and X = guest molecule mole fraction. The studied systems can be classified in two groups : the first one presenting only inhibition of positronium formation and the second one presenting inhibition and quenching effects. The inhibition and quenching constants were determined.



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