Two-electron one-photon decay rates in doubly ionised atoms. II

Nour-Eddin Essarroukh, Philippe Antoine, Pierre-Célestin Karangwa +2 more

S. I. Lavrinenko, Vitalii G Pal'chikov

G Laplanche, M. Jaouen, A. Rachman

For pt.I see ibid., vol.19, p.79 (1986). The authors study the two-photon ionisation of unpolarised target atoms of caesium in their ground state or in one of the two first excited states 6P 1/2 or 6P 3/2 in the non-resonant region. Circularly, linearly and unpolarised light are considered. For each case they give a systematic analysis of generalised transition probabilities, angular distributions and polarisation phenomena. In particular, it is shown that polarised electrons can be obtained even with linearly or unpolarised light.

M. Ya. Amus’ya, I. S. Li

Erna Karule

Two-photon ionisation of atomic hydrogen in the ground state with linearly and circularly polarised light is considered. In the region above the one-photon ionisation threshold expressions for the two-photon ionisation transition matrix elements are obtained using the non-relativistic dipole approximation. The two-photon ionisation rate is calculated above and below the one-photon ionisation threshold. Above threshold the total cross section for two-photon ionisation has no resonances and diminishes more rapidly than the photoionisation cross section as the wavelength decreases.

R I Jackson, Dennis P. O’Brien, S. Swain