ELECTRONIC-TRANSITION MOMENT OF THE ALO(B-2-SIGMA(-X(2)SIGMA(+)) EMISSION - ANALYSIS OF THE R DEPENDENCE OF THE AL2+O2- CHARACTER IN THE X(2)SIGMA(+) STATE())

The dependence of the electronic transition moment, R(c)(R), of the Al O(B (2) Sigma(+)-X (2) Sigma(+)) system on the internuclear distance, R, has been determined by an analysis of the intensity distribution of the emission spectra as R(e)(R)=[1 - 2.29(13)(R/Angstrom - 1.5)(2)] ( 1.510 Angstrom less than or equal to R less than or equal to 1.836 Ang strom). The R dependences of R(e)(R) and the X (2) Sigma(+) similar to A (IIi)-I-2 off-diagonal spin-orbit interaction matrix element, H-el( SO)(R), have been analyzed simultaneously to evaluate the R dependence of the Al2+O2- character in the X (2) Sigma(+) state and that of the orbital exponent of the oxygen atom. The results agree with the theore tical prediction by Lengsfield and Liu (J. Chem. Phys. 77 (1982) 6083) that the charge-transfer process, Al2+O2- --> Al+O-, takes place in t he range of 1.6 Angstrom less than or similar to R < less than or simi lar to 2.1 Angstrom.