The photodetachment cross section of the atomic phosphorus anion

الملخص EN

The absolute value of the photodetachment cross section of the atomic phosphorus negative ion, P, in the gas phase is calculated for photon energies in the range 0-2.

leV using a screened hydrogenic (SH) model.

The mpdel employs a hydrogen-likc wave function for the "extra" electron undergoing detachment with one adjustable parameter chosen to be the effective “screened” nuclear charge.

The calculated absolute cross section agrees with previous experimental and theoretical results where the optimum value of this parameter is 2.4 .

The threshold behavior of all single-channel photodetachment cross sections is calculated using both the SH and extended zero-core-contribution (ZCC) models in order to explore the validity region of Wigner threshold law for photon energies in the range 0.70-0.760eV.

The values of both the Wigner parameter, Cl, and the corresponding first-order correction parameter, b, are deduced for both models.