By I. PRIGOGINE, STUART A. RICE
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Extra info for Advances in Chemical Physics, Vol. 48
This is indicated by the results in Table VI. Thus it seems possible that the second highest energy peak in the experimental spectrum could be a superposition of a 'Z: peak and a ' E l peak. In fact, more recent XPS e~perirnents"~ resolve the 30-35 eV region of the spectrum into two peaks rather than one, as displayed in Fig. 2. There are a number of problems that weigh against the further enlarging the P-space to include the important 5-block operators in an attempt to obtain a more accurate calculated spectrum.
This is the first indication of another problem that dictates the course of much of the subsequent work presented below. In all the IP- EA calculations below, we follow YeagerM and employ the symmetrized EOM equation (2 1) and symmetrized shake-up operators. B. , when the only approximation is due to the choice of a finite orbital basis). Evidence from CI studies has shown that rather extensive orbital basis sets are needed to provide reliable results in molecular calculations. On the other hand, the early EOM computations of Simons and c o - w o r k e r ~ ~had ’ ~ ~been restricted to rather small basis sets because of computer limitations.
These are the second-order matrix elements that are now in A,, and contributions from including the 5-block in the Q space. In this section we report EOM calculations for a number of atomic and molecular systems. The effects of these additional second-order terms are specifically studied and compared with accurate configuration interaction studies. By comparison of the EOM IPS and EAs to highly converged CI results, rather than to experimental numbers, basis set errors can be eliminated. ) This focuses on the validity of various approximations introduced in solving the EOM equations.
Advances in Chemical Physics, Vol. 48 by I. PRIGOGINE, STUART A. RICE