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38 QUASI-DIABATIZATION 279<br />

The calculation produces the following table<br />

Mixing angles and non-adiabatic coupling matrix elements for H2S<br />

R MIXCI MIXTOT DCHI NACMECI<br />

2.55 15.2694 15.2644 -5.2226 -5.2365<br />

2.60 27.8740 27.8772 -3.4702 -3.4794<br />

Diabatic energies for H2S, obtained from CI-vectors<br />

R E1 E2 H11CI H22CI H21CI<br />

2.55 -398.64572746 -398.63666636 -398.64509901 -398.63729481 -0.002302<br />

2.60 -398.64911752 -398.63771802 -398.64662578 -398.64020976 -0.004711<br />

Diabatic energies for H2S, obtained from CI-vectors and orbital correction<br />

R E1 E2 H11 H22 H21<br />

2.55 -398.64572746 -398.63666636 -398.64509941 -398.63729441 -0.002301<br />

2.60 -398.64911752 -398.63771802 -398.64662526 -398.64021027 -0.004711<br />

As expected the coupling matrix elements obtained from the 3-point DDR calculation (NACMECI)<br />

and by differentiating the mixing angle (DCHI) are in close agreement.

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