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The SiO molecule belongs to a set of molecules of great astrophysical interest. Its photodissociation can be important in the research of the molecular balance in stellar envelopes of the Mira-type variable stars where the SiO molecule is a source of maser emission at the frequencies of ro-vibrational transitions J=2-1 (v=1,2,3). We have applied the MRCI with the aug-cc-pVQZ basis set to obtain the ground state and excited 1Σ+ potential curves that seemed to be a proper candidate of the photodissociation process.