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Ho, YK.  1992.  Resonances in positron-atom scattering. Hyperfine Interactions. 73:109–130., Number 1-2: Springer Abstract1992_3.pdf

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Ho, YK, Kar S.  2009.  Effect of Debye plasmas on the resonance states of two-electron highly stripped ions using the stabilization method. Journal of Physics: Conference Series. 163:012095., Number 1: IOP Publishing Abstract2009_7.pdf

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Ho, YK.  1979.  Autoionisation states of helium isoelectric sequence below the n=3 hydrogenic thresholds. Journal of Physics B: Atomic and Molecular Physics. 12:387., Number 3 Abstract1979_1.pdfWebsite

The complex rotation method is applied to calculate autoionisation states ( 1 S e , 1 P o and 3 P o ) of the helium isoelectronic sequence (Z=2-10) below the n=3 hydrogenic thresholds. The Hylleraas-type wavefunctions are employed and up to 161 terms for S states and 165 terms for P states are used, so that several lower-lying states are determined. For He and Li + states, comparisons are made with other calculations and experiments. The width of the lowest 1 P o state of helium below the n=3 threshold is determined to be (191+or-7) meV which differs quite significantly from the experimental value of (132+or-14) meV of Dhez and Ederer (1973). Furthermore, it is concluded that the width computed by the complex rotation method would not reduce to the experimental value even if more terms in the wavefunction are used.

Ho, YK, Callaway J.  1984.  Supermultiplet structures of doubly excited states of H-below the N= 6 hydrogen threshold. Journal of Physics B: Atomic and Molecular Physics. 17:L559., Number 17: IOP Publishing Abstract1984_6.pdf

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Ho, YK, Henry RJW.  1987.  Oscillator Strengths for S I, S II, and S III. Physica Scripta. 35:831., Number 6 Abstract1987_1.pdfWebsite

Recent theoretical calculations of oscillator strengths for dipole allowed transitions of S I, S II, and S III are reviewed.

Ho, YK.  2002.  Doubly-Excited States of Two-Electron Atomic Systems in External Fields. Resonances in Few-Body Systems. :23–35.: Springer Abstract2002_5.pdf

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Ho, YK.  1991.  Doubly excited states of S XV. Physica Scripta. 44:559., Number 6: IOP Publishing Abstract1991_4.pdf

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Ho, YK, Bhatia AK.  1994.  \^{}$\{$1, 3$\}$ D\^{}$\{$o$\}$ resonant states in Ps\^{}$\{$-$\}$. Physical Review A. 50:2155., Number 3: APS Abstract1994_6.pdf

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Ho, YK, Yan Z-C.  2002.  High-angular-momentum resonances in positron scattering by a ${\mathrm{He}}^{+}$ ion, Dec. Phys. Rev. A. 66:062705.: American Physical Society Abstract2002_1.pdfWebsite

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Ho, YK.  1977.  Autoionisation states of H-below the N= 3 hydrogenic threshold. Journal of Physics B: Atomic and Molecular Physics. 10:L373., Number 10: IOP Publishing Abstract1977_1.pdf

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Ho, YK, Henry RJW.  1984.  Oscillator strengths for O(II) ions. Journal of Quantitative Spectroscopy and Radiative Transfer. 31:57-62., Number 1 Abstract1984_5.pdfWebsite

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Ho, YK.  1986.  Doubly excited $^{1}\mathrm{S}^{\mathrm{e}}$ resonance states of helium atoms below the \textit{N} hydrogenic thresholds with \textit{N$łe${}6}, Nov. Phys. Rev. A. 34:4402–4404.: American Physical Society Abstract1986_1.pdfWebsite

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Ho, YK, Bhatia AK.  1991.  \^{}$\{$1, 3$\}$ P\^{}$\{$o$\}$ resonance states in positronium ions. Physical Review A. 44:2890., Number 5: APS Abstract1991_6.pdf

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Ho, YK.  1994.  F-wave shape resonances in e< sup>--H scattering above the hydrogen< i> N= 3 threshold. Physics Letters A. 189:374–378., Number 5: Elsevier Abstract1994_4.pdf

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Ho, YK, Ivanov IA.  2001.  dc Stark effect for doubly excited Feshbach resonance states of the positronium negative ion below the $N=2$ threshold of a positronium atom, May. Phys. Rev. A. 63:062503.: American Physical Society Abstract2001_1.pdfWebsite

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Ivanov, IA, Ho YK.  2000.  Supermultiplet structure of the doubly excited positronium negative ion. Physical Review A. 61:032501., Number 3: APS Abstract2000_9.pdf

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Ivanov, IA, Ho YK.  2001.  Supermultiplet structure of the doubly excited positronium negative ion. Nuclear Physics A. 684:672-674., Number 1–4 Abstract2001_8.pdfWebsite

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Ivanov, I, Ho YK.  1999.  High-angular-momentum $(L> 3)$ doubly excited resonance states of the positronium negative ion, Aug. Phys. Rev. A. 60:1015–1020.: American Physical Society Abstract1999_1.pdfWebsite

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Ivanov, IA, Ho YK.  2001.  Hylleraas Basis Calculation of the Doubly Excited States in Heliumlike Ions. Chinese Journal of Physics. 39, Number 5 Abstract2001_3.pdf

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Ivanov, IA, Ho YK.  2004.  Complex rotation method for the Dirac Hamiltonian. Physical Review A. 69:023407., Number 2: APS Abstract2004_4.pdf

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