# One particle in a potential -1/*r* + lambda/*r* (1-exp(-delta *r*))

## A plot of ionization energy near lambda = 1

Ground state ionization energy (i.e. -Re E) as a function of lambda for
delta = 0.6, 0.8, 1, 1.2, 1.5, 2. Bold curve is Coulomb energy 1/2 (lambda-1)^2
corresponding to infinite delta . If delta is larger than 1.19 then the
potential at lambda=1 (which is Yukawa potential) does not support bound
states. At this screening parameter, behavior of the ionization energy near
the border of continuum changes from linear to quadratic.

A program

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Designed by A. Sergeev.