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In the previous paper, the authors pointed out correspondence of asupersymmetric double-well matrix model with two-dimensional type IIAsuperstring theory on a nontrivial Ramond-Ramond background from the viewpointof symmetries and spectrum. In this paper we further investigate thecorrespondence from dynamical aspects by comparing scattering amplitudes in thematrix model and those in the type IIA theory. In the latter, cocycle factorsare introduced to vertex operators in order to reproduce correct transformationlaws and target-space statistics. By a perturbative treatment of theRamond-Ramond background as insertions of the corresponding vertex operators,various IIA amplitudes are explicitly computed including quantitatively precisenumerical factors. We show that several kinds of amplitudes in both sidesindeed have exactly the same dependence on parameters of the theory. Moreover,we have a number of relations among coefficients which connect quantities inthe type IIA theory and those in the matrix model. Consistency of the relationsconvinces us of the validity of the correspondence.

Supersymmetric double-well matrix model as two-dimensional type IIA superstring on RR background