Bibliographic Details
| Title: |
The two-photon detachment of the positronium negative ion. |
| Authors: |
Mitchell, William1 (AUTHOR) williammitchell3@my.unt.edu, Ward, Sandra J.1 (AUTHOR) Sandra.Quintanilla@unt.edu |
| Source: |
European Physical Journal D (EPJ D). May2026, Vol. 80 Issue 5, p1-16. 16p. |
| Subjects: |
Positronium, Multiphoton ionization, Variational approach (Mathematics), Rayleigh-Ritz method, Absorption cross sections, Wave functions, Binding energy |
| Abstract: |
We present our calculations of the two-photon detachment cross section of the positronium negative ion (Ps - ), in both the length and velocity forms for energies below the Ps( n = 2 ) threshold. We consider both the 1 S and 1 D final states. We employ the Rayleigh–Ritz method to determine the Ps - binding energy and the corresponding 1 S bound-state wave function. We use the complex Kohn variational method to obtain the 1 S and 1 D final-state wavefunctions, and we solve an inhomogeneous differential equation to obtain the 1 P intermediate-state wave function. The 1 S bound-state, 1 P intermediate-state, and final-state wave functions contain Hylleraas functions. We investigate the applicability of the Wigner's and a modified Wigner's threshold laws to the one- and two-photon detachment cross sections of Ps - near the ionization threshold. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
