Photodetachment cross section of lithium negative ion

Photodetachment cross sections of the positronium negative ion

The cross sections for the photodetachment from a weakly bound positronium negative ion Ps− below the threshold for the formation of Ps(n = 4) are calculated using the hyperspherical close-coupling method, and are compared with the corresponding spectra for the H− ion. Detailed resonance structures in the spectra near the Ps(n = 2, 3 and 4) thresholds are reported for the first time. The off-re...

Resonances in the photodetachment cross section of Au -

This paper reports the observation of autodetaching resonances in photoelectron spectroscopy of Au according to the process Au2 + hv=:> (Aur ) * => Au 2 + e . They appear as sharp features superimposed upon a nearly constant signal associated with direct photodetachment process from Aur :Au + hv=>Au2 + e . By altering the cluster expansion conditions, the dimer anion temperature can be varied. ...

Mass Spectra and Photodetachment of Sodium Fluoride Negative Ion Clusters

A flowing afterglow discharge ion source with NaF vaporized into the flow produces the expected stable anions F-(NaF),, as well as the unusual species Na(NaF); and (NaF); (n < 17). The dominance of (NaF); suggests that it has a particularly stable structure. A fixed-frequency laser has been used to photodetach electrons from mass-selected ion beams extracted from the flowing afterglow. Photoele...

Resonance structure in the Li- photodetachment cross section.

We report on the first observation of resonance structure in the total cross section for the photodetachment of Li −. The structure arises from the autode-taching decay of doubly excited 1 P o states of Li − that are bound with respect to the 3p state of the Li atom. Calculations have been performed for both Li − and H − to assist in the identification of these resonances. The lowest lying reso...

Novel Doubly Excited States Produced in Negative Ion Photodetachment