Analysis and algorithms for the computation of the excited states of helium

In this paper, we study a dimensionally scaled helium atom model for excited states of helium. The mathematical analysis of the corresponding effective energy potential is presented. Two simple numerical algorithms are developed for the computation of the excited states of helium. Comparison between our numerical results and those in the existing literature is given to indicate the accuracy and efficiency of the proposed algorithms.

[1]  D. Herschbach Dimensional interpolation for two‐electron atoms , 1986 .

[2]  O. Sǐnanoğlu,et al.  Comparison of doubly-excited helium energy levels, isoelectronic series, autoionization lifetimes, and group-theoretical configuration-mixing predictions with large-configuration-interaction calculations and experimental spectra , 1975 .

[3]  Mark S. C. Reed,et al.  Method of Modern Mathematical Physics , 1972 .

[4]  W. Rudin Principles of mathematical analysis , 1964 .

[5]  K. Richter,et al.  The theory of two-electron atoms: between ground state and complete fragmentation , 2000 .

[6]  Alain Perronnet,et al.  Visualization and dimensional scaling for some three-body problems in atomic and molecular quantum mechanics , 2008 .

[7]  Lindroth Calculation of doubly excited states of helium with a finite discrete spectrum. , 1994, Physical review. A, Atomic, molecular, and optical physics.

[8]  Ho,et al.  Complex-coordinate calculation of 1,3D resonances in two-electron systems. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[9]  A Burgers,et al.  Highly doubly excited S states of the helium atom , 1995 .

[10]  R. Madden,et al.  NEW AUTOIONIZING ATOMIC ENERGY LEVELS IN He, Ne, AND Ar , 1963 .

[11]  Edward Witten,et al.  Quarks, atoms, and the 1/N expansion , 1980 .

[12]  D. Herschbach,et al.  Dimensional Scaling in Chemical Physics , 1993 .

[13]  G. G. Stokes "J." , 1890, The New Yale Book of Quotations.

[14]  D. Herrick Degeneracies in energy levels of quantum systems of variable dimensionality , 1975 .

[15]  P. Rabinowitz,et al.  Dual variational methods in critical point theory and applications , 1973 .

[16]  D. Herschbach,et al.  New methods in quantum theory , 1996 .

[17]  D. Herschbach,et al.  Pseudomolecular atoms: geometry of two-electron intrashell excited states , 1988 .

[18]  E. C. Kemble The Fundamental Principles Of Quantum Mechanics , 1937 .

[19]  D. Herschbach,et al.  Hylleraas–Pekeris treatment of D‐dimensional two‐electron atoms , 1986 .

[20]  Salomonson,et al.  Solution of the pair equation using a finite discrete spectrum. , 1989, Physical review. A, General physics.

[21]  J. Rohlf Modern Physics from a to Z , 1994 .

[22]  J. D. Louck,et al.  Generalized orbital angular momentum and the n-fold degenerate quantum-mechanical oscillator: Part I. The twofold degenerate oscillator , 1960 .