Born: 17 December 1946
- He is a theoretical chemist, well known for his research in the fields of molecular many-body theory, theoretical spectroscopy, finite temperature non-perturbative many-body theories.
- He has been the first to develop and implement a class of many-body methods for an electronic structure which is now standard works in the field.
- These methods, collectively called multireference coupled cluster formalisms, are versatile and powerful methods for predicting with quantitative accuracy the energetics and cross-sections of a vast range of molecular excitations and ionization.
- A long-standing problem of guaranteeing proper scaling of energy for many-electron wave-functions of arbitrary complexity has also been first resolved by him.
- He has also been the first to develop a rigorously size-extensive state-specific multi-reference coupled-cluster formalism and its perturbative counterpart which is getting increasingly recognized as a very promising methodological advance.
- The attractive aspects of his formalisms are compactness and high accuracy.
- These are now accepted as pioneering and standard works in the field.
- which has attracted wide international attention.
- He has also developed a rigorous finite-temperature non-perturbative field theory to study the thermodynamics of strongly interacting many-body systems, which is now being applied extensively to study dynamics of vibronic coupling at finite temperature.
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December 17, 2019