Ionization in a 1-Dimensional Dipole Model

Details Ionization in a 1-Dimensional Dipole Model Ionization in a 1-Dimensional Dipole Model

2006-09-25

arxiv.org/abs/math-ph/0609069v2

Physics

Mathematical Physics

Corrected proof, extensive changes. 39 pages, 1 figure

Scientific paper

We study the evolution of a one dimensional model atom with $\delta$-function binding potential, subjected to a dipole radiation field $E(t) x$ with $E(t)$ a $2\pi/\omega$-periodic real-valued function. Starting with $\psi(x,t=0)$ an initially localized state and $E(t)$ a trigonometric polynomial, complete ionization occurs; the probability of finding the electron in any fixed region goes to zero. For $\psi(x,0)$ compactly supported and general periodic fields, we construct a resonance expansion. Each resonance is given explicitly as a Gamow vector, and is $2\pi/\omega$ periodic in time and behaves like the exponentially growing Green's function near $x=\pm \infty$. The remainder is given by an asymptotic power series in $t^{-1/2}$ with coefficients varying with $x$.

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