Isaiah Shavitt

High-level multireference methods in the quantum-chemistry program system COLUMBUS: Analytic MR-CISD and MR-AQCC gradients and MR-AQCC-LRT for excited states, GUGA spin–orbit CI and parallel CI density

Hans Lischka, Ron Shepard, Russell M. Pitzer et al. · Physical Chemistry Chemical Physics · 2001 · 431 citations

Natural Sciences, Chemistry, Physics +17

A progress report on the status of the COLUMBUSMRCI program system

Ron Shepard, Isaiah Shavitt, Russell M. Pitzer et al. · International Journal of Quantum Chemistry · 1988 · 358 citations

Natural Sciences, Chemistry, Computer Science +17

Quasidegenerate perturbation theories. A canonical van Vleck formalism and its relationship to other approaches

Isaiah Shavitt, Lynn T. Redmon · The Journal of Chemical Physics · 1980 · 313 citations

Natural Sciences, Physics, Mathematical Physics +9

An application of perturbation theory ideas in configuration interaction calculations

Z. Gershgorn, Isaiah Shavitt · International Journal of Quantum Chemistry · 1968 · 263 citations

Natural Sciences, Chemistry, Physics +16

Comparison of high-order many-body perturbation theory and configuration interaction for H2O

Rodney J. Bartlett, Isaiah Shavitt · Chemical Physics Letters · 1977 · 262 citations

Natural Sciences, Chemistry, Physics +14