We demonstrated transferring the stability of one highly stable clock laser operating at 729 nm to another less stable laser operating at 698 nm. The two different wavelengths

The photoion Li 2ϩ /Li ϩ production cross section ratio of ground-state atomic lithium has been measured for photon energies ranging from 80 to 424 eV. The absolute cross sections for the Li 2ϩ and Li ϩ yield are also derived. In this energy region, the Li 2ϩ /Li ϩ ratio reaches a plateau of about 1.0% before reaching a maximum of about 4.5%, then decreases slowly. Good agreement is found between the measured total photoionization cross sections of lithium and theoretical calculations. The Li 2ϩ /Li ϩ ratio is also compared to the He 2ϩ /He ϩ ratio from excited He(1s2s) for photon energies up to 70 eV above threshold. The branching ratio of Li 2ϩ to total Li ion production is also compared to the single-ionization cross section of electron impact on Li ϩ ions.

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