## Abstract

Absolute two-photon detachment cross sections and photoelectron angular

distribution are calculated for halogen negative ions within lowest-order

perturbation theory. The outer $np$ ground-state wavefunctions are

determined using the Dyson equation method. The {\em ab initio} correlation

potential is scaled by introduction of a free parameter. We choose it to

ensure that the $np$ wavefunctions have a proper asymptotic behavior

$P(r)\propto \exp (-\kappa r)$, corresponding to correct

(experimental) binding energies $E_b=\hbar ^2\kappa ^2/2m$. The latter

is crucial for obtaining correct absolute values of the multiphoton

cross sections (Gribakin and Kuchiev 1997 {\em Phys. Rev. A} {\bf 55} 3760).

Comparisons with previous calculations and experimental data are performed.

distribution are calculated for halogen negative ions within lowest-order

perturbation theory. The outer $np$ ground-state wavefunctions are

determined using the Dyson equation method. The {\em ab initio} correlation

potential is scaled by introduction of a free parameter. We choose it to

ensure that the $np$ wavefunctions have a proper asymptotic behavior

$P(r)\propto \exp (-\kappa r)$, corresponding to correct

(experimental) binding energies $E_b=\hbar ^2\kappa ^2/2m$. The latter

is crucial for obtaining correct absolute values of the multiphoton

cross sections (Gribakin and Kuchiev 1997 {\em Phys. Rev. A} {\bf 55} 3760).

Comparisons with previous calculations and experimental data are performed.

Original language | English |
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Pages (from-to) | 5463-5478 |

Number of pages | 16 |

Journal | Journal of Physics B: Atomic Molecular and Optical Physics |

Volume | 32 |

Issue number | 23 |

DOIs | |

Publication status | Published - 14 Dec 1999 |