Abstract
We present the first measurements of the photoionization cross-section of the 3p 2P1/2, 3/2 excited states for both the lithium isotopes Li6 and Li7 in the region close to the Li+ 1s2 1S threshold (from 0 to 3 eV) using the two-step photoionization and the saturation technique. Narrow linewidth dye lasers have been used in combination with a locally developed atomic beam-TOF mass spectrometer to measure the photoion signals as a function of energy density of the ionizing laser. It is observed that the cross-section is maximum near the ionization threshold and decreases monotonically as the excess photon energy of the ionizing laser is increased. The deduced number densities of the isotopes are Li6 (1.2 × 108 atoms cm−3) and Li7 (1.2 × 109 atoms cm−3), which are found to be close to their natural abundance ratio within the experimental error. Our experimental results of the measurement of the cross-section are also in good agreement with earlier theoretical work.
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