Publications

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Kar, S, Ho YK.  2011.  Borromean binding in with screened Coulomb potentials. Chemical Physics Letters. 506:282–285., Number 4: Elsevier Abstract2011_1.pdf

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Kar, S, Ho YK.  2004.  S-wave resonances in e+–He scattering below the Ps (n= 2) excitation threshold. Journal of Physics B: Atomic, Molecular and Optical Physics. 37:3177., Number 15: IOP Publishing Abstract2004_8.pdf

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Kar, S, Ho YK.  2009.  One-photon two-electron transitions for metastable helium. The European Physical Journal D. 53:303–307., Number 3: Springer Abstract2009_14.pdf

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Kar, S, Ho YK.  2006.  Doubly excited\^{}$\{$1, 3$\}$ P\^{}$\{$o$\}$ resonance states of Ps\^{}$\{$-$\}$ in weakly coupled plasmas. Physical Review A. 73:032502., Number 3: APS Abstract2006_3.pdf

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Kar, S, Ho YK.  2016.  High-lying doubly excited resonances in Ps - nteracting with screened Coulomb potentials. Chin. J. Phys. . 54:574.ho_kar_cjp_2016.pdf
Kar, S, Ho YK.  2007.  Resonance states of three self-gravitating bosons and fermions. Physical Review A. 76:032711., Number 3: APS Abstract2007_11.pdf

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Kar, S, Ho YK.  2009.  D-wave resonances in three-body system Ps- with pure Coulomb and Screened Coulomb (Yukawa) Potentials. Few-Body Systems. 45:43–49., Number 1: Springer Abstract2009_2.pdf

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Kar, S, Ho YK.  2005.  Resonances in positron scattering from Na and K. The European Physical Journal D-Atomic, Molecular, Optical and Plasma Physics. 35:453–459., Number 3: Springer Abstract2005_6.pdf

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Kar, S, Ho YK.  2009.  Doubly excited 1, 3 P e resonance states of the positronium negative ion with Coulomb and screened Coulomb potentials. Few-Body Systems. 46:173–181., Number 3: Springer Abstract2009_3.pdf

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Kar, S, Ho YK.  2008.  Photodetachment of the positronium negative ion interacting with screened Coulomb (Yukawa) potentials. Few-Body Systems. 42:73-81., Number 1-4: Springer-Verlag Abstract2008_11.pdfWebsite

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Kar, S, Ho YK.  2005.  Ground state and resonance state of Ps\^{}$\{$-$\}$ in plasmas with various Debye lengths. Physical Review A. 71:052503., Number 5: APS Abstract
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Kar, S, Ho YK.  2007.  Bound states and resonance states of the plasma-embedded $pp$μ${}$ molecular ion, Jun. Phys. Rev. A. 75:062509.: American Physical Society Abstract2007_1.pdfWebsite

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Kar, S, Ho YK.  2010.  Calculations of D-wave bound states and resonance states of the screened helium atom using correlated exponential wave functions. International Journal of Quantum Chemistry. 110:993–1002., Number 5: Wiley Online Library Abstract2010_5.pdf

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Kar, S, Ho YK.  2008.  Dipole polarizabilities of plasma-embedded Ps− and H− ions. Physics Letters A. 372:4253-4256., Number 23 Abstract2008_5.pdfWebsite

We have investigated the effect of weakly coupled hot plasmas on the dipole polarizabilities of positronium negative ion and hydrogen negative ion. The plasma effect is taken care of by employing a screened Coulomb (Yukawa) potential of Debye type, and highly correlated exponential wave functions are used. Dipole polarizabilities for various screening parameters are reported.

Kar, S, Ho YK.  2012.  Borromean windows for H+ 2 with screened Coulomb potentials. PHYSICAL REVIEW A . 86(014502)2012_13.pdf
Kar, S, Ho YK.  2005.  Electron affinity of the hydrogen atom and a resonance state of the hydrogen negative ion embedded in Debye plasmas. New Journal of Physics. 7:141., Number 1: IOP Publishing Abstract2005_3.pdf

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Kar, S, Ho YK.  2005.  Doubly-excited 2s2 1Se resonance state of helium embedded in Debye plasmas. Chemical Physics Letters. 402:544-548., Number 4–6 Abstract2005_2.pdfWebsite

We have made a first investigation on the resonances in two electron systems in various model plasma environments. The 2s2 1Se autoionization resonance state in the helium atom is determined by calculating the density of resonance states using the stabilization method. A screened Coulomb potential obtained from the Debye model is used to represent the interaction between the charged particles. A correlated wave function has been used to represent the correlation effect between the three charge particles. The calculated resonance energies and widths for various Debye parameters ranging from infinity to a small value along with the ground state energies are reported.

Kar, S, Ho YK.  2007.  The doubly-excited 2p2 1De resonance state of the helium atom in hot-dense plasmas. Physica Scripta. 75:13-18., Number 1: IOP Publishing Abstract2007_7.pdf

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Kar, S, Ho YK.  2008.  Photodetachment of the hydrogen negative ion in weakly coupled plasmas. Physics of Plasmas. 15:013301. Abstract2008_10.pdf

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Kar, S, Ho YK.  2011.  Doubly excited\^{}$\{$1, 3$\}$ P\^{}$\{$e$\}$ resonance states of helium and the hydrogen negative ion interacting with Coulomb and screened Coulomb potentials. Physical Review A. 83:042506., Number 4: APS Abstract2011_6.pdf

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