Photoelectron Angular Distribution, Photoion Alignment, and Spin Polarization

Photoelectron Angular Distribution, Photoion Alignment, and Spin Polarization. 595... 

A simple measurement of the total photoionization cross section (isotropic sample, cross section measured at a specified photon energy, integrated over all photoejection angles, without specification of the internal state of the photoion, without determination of ms of the ejected electron) contains no information about the distribution of Z, m -values of the ejected electron. However, measurable properties of the photoionization event can provide information about the mechanism of the photoionization process. The frequently measured quantities included f3, Aq, and A. The ft quantity describes the angular distribution of the photoelectrons and is defined analogously to the (3 for photodissociation (see Section 7.2.4), Ajp is the alignment ( Mm distribution) of the photoion. A (not to be confused with the spin-orbit constant) or alternatively P, is the spin-polarization of the ejected electron, which is relevant when the photoion has nonzero spin. 

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