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- Shampa Raghunathan, Mathias Nest
- The Journal of chemical physics
- 2012

Explicitly time-dependent density functional theory (TDDFT) is a formally exact theory, which can treat very large systems. However, in practice it is used almost exclusively in the adiabatic approximation and with standard ground state functionals. Therefore, if combined with coherent control theory, it is not clear which control tasks can be achieved… (More)

- Shampa Raghunathan, Mathias Nest
- The journal of physical chemistry. A
- 2012

Explicitly time-dependent density functional theory (TDDFT) has often been suggested as the method of choice for controlling the correlated dynamics of many electron systems. However, it is not yet clear which control tasks can be achieved reliably and how this depends on the functionals used. In this article, we show that the control task of creating a… (More)

- Shampa Raghunathan, Mathias Nest
- Journal of chemical theory and computation
- 2012

We will show that adiabatic real-time TDDFT predicts a time- and energy-dependent electronic structure of molecules, which makes it hard to combine TDDFT with coherent control schemes that depend on resonance conditions. In this study, we use sequences of ultrashort pulses, separated by long intervals of field free evolution, to illustrate this phenomenon… (More)

- Shampa Raghunathan, Rabindra Mahavidyalaya
- 2014

I am currently involved in developing novel, computationally efficient multipolar models using optimized point charges [9]. These models, implemented in the program CHARMM, provide analytical forces so as to accelerate MD simulations and furthermore, lead to energy conservation in NVE simulations .

- Shampa Raghunathan, Mathias Nest
- Journal of chemical theory and computation
- 2011

We compare the performance of explicitly time-dependent density functional theory (DFT) with time-dependent configuration interaction (TDCI) to achieve the control task of a population inversion in LiCN. We assume that if a given pulse achieves the control task when used in TDCI, then there should be a pulse with similar frequency and intensity that… (More)

- Mike Devereux, Shampa Raghunathan, Dmitri G Fedorov, Markus Meuwly
- Journal of chemical theory and computation
- 2014

A truncated multipole expansion can be re-expressed exactly using an appropriate arrangement of point charges. This means that groups of point charges that are shifted away from nuclear coordinates can be used to achieve accurate electrostatics for molecular systems. We introduce a multipolar electrostatic model formulated in this way for use in… (More)

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