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- W1990891294 abstract "Although it is quite promising to compute the spectroscopic energies [say, ionization potential (IP)] via the traditional valence-universal multireference coupled cluster (VUMRCC) method based on the description of the complete model space being seriously plagued by the perennial intruder state problem, the eigenvalue independent partitioning (EIP) based VUMRCC (coined as EIP-MRCC) method is quite effective to predict the spectroscopic energies in an intruder-free manner. Hence, the EIP-MRCC method is suitable for generating both the principal IPs and the satellite IPs of the inner-valence region. An EIP strategy converts the nonlinear VUMRCC equations for M(m,n) dimensional model space of m hole and n particle to a non-Hermitian eigenproblem of larger dimension whose M(m,n) roots are only physically meaningful. To increase the quality of the computed energy differences in the sense of chemical accuracy and to locate the correct position of it in the spectrum, the inclusion of higher-body cluster operators on top of all the standard singles-doubles is not the only pivotal issue, the effect of the size of the basis set is also equally important. This paper illustrates these issues by calculating the principal and satellite IPs of HF and HCl molecules using various basis sets (viz., Dunning's cc-pVDZ, cc-pVTZ, and cc-pVQZ) via EIP-MRCC method with full inclusion of triples (abbreviated as EIP-MRCCSDT). The results seem quite encouraging in comparison with the experimental values. The controversial Π2 satellite at 28.67eV of HCl of Svensson et al. [J. Chem. Phys. 89, 7193 (1988)] is also reported." @default.
- W1990891294 created "2016-06-24" @default.
- W1990891294 creator A5015385513 @default.
- W1990891294 creator A5064955899 @default.
- W1990891294 creator A5085692539 @default.
- W1990891294 date "2006-12-28" @default.
- W1990891294 modified "2023-09-27" @default.
- W1990891294 title "Explicitly intruder-free valence-universal multireference coupled cluster theory as applied to ionization spectroscopy" @default.
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