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An attempt has been made to stndy the applicability of MORSE and RKR potentials to the transition (A12: --XI2Y) of BaO band system, from various aspects. For this purpose, theoretically computed Franck Condon (FC) factors and r-centroids (~v,v-) with the use of both MORSE and RKR potentials have been employed to derive Re(r), a relation between R e the electronic transition moment, and r, the internuelear separation, both by linear and quadratic fitting. Using these Be(r ) relations, smoothed Condon (Pv, w) factors have been arrived at and compared with their values before such improvement and also with the experimental band strengths (I/va). Vibratiorial temperature of the source has been determined with R e constant and with Re as va¡ in r. In the light of all these resuhs, the efficacy of MORSE potential relative to RKR one has been discussed.

A comparative study of both RKR and MORSE potentials as applied to AIO(At2~ --X2Z~) band system has been made through various tests. Franck--Condon (FC) factors and r-centroids (~~~,) with the use of RKR potential have been evaluated and have been employed to derive the expression Re(r ) for electronic transition moment variation with internuclear distance r, both by linear and quadratie fitting. Using such Re (r ) relations in conjunction with FC factors and also with experimental band strengths (I]v~,~), Smoothed Condon (P~,~) factors and ~(----. I/Pv,~v~,t.,), the ratio of experimental band strength (I]%,~,) to the calculated Smoothed Condon (P~'~,) factor has been determine& Through the comparison of P~~,,'s and /~'s of RKR potential and of MORSE potential, the efficacy of MoRsa. potential relative to RKR has been discussed. Vibrational temperatures for al] the three thermal sources of excitation of bands, viz. Shock Tube, Low Pressure Arc and Exploding Wire have been deduced both undcr constancy of R e and variation of R e with r. These estimates on vibrational temperatures with the source temperatures have been discussed in the light of the findings of LINTON and 1NIICHOLLS and conclusions regarding relative merits of the two potentials indicated.

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