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Laser isotope separation of lithium by two-step photoionization
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Image of FIG. 1.
FIG. 1.

(Color online) Schematic diagram of an experimental setup for the two-step photoionization of the atomic isotopes.

Image of FIG. 2.
FIG. 2.

(Color online) TOF distribution of lithium isotopes, and , as a result of the two-step photoionization from the excited state. Laser pulse is used as the reference to measure the time of flight of the isotopic signals.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Two-step photoionization scheme of lithium isotopes, used for the fine structure levels resolved and the measurement of the photoionization cross section of the corresponding levels. (b) Dependence of the photoion current on the exciter laser wavelength in the case of natural isotopic abundant lithium sample.

Image of FIG. 4.
FIG. 4.

(Color online) Power-broadening effect in relation to the energy density of the exciter laser (energy density of the ionizer laser, ).

Image of FIG. 5.
FIG. 5.

(Color online) (a) Dependence of the photoion signal ion intensity on the exciter laser wavelength. Each data point is calculated from the area under the curve for each isotopic peak. (b) Dependence of the enrichment of the on the exciter laser wavelength (exciter laser linewidth ; exciter laser intensity, ; ionizing laser intensity, ).

Image of FIG. 6.
FIG. 6.

(Color online) The fitted curves to the experimental data using Eq. (1) are used for the determination of the absolute value of the cross sections from the , fine energy levels of the (a) and (b) using 349.85, 335.4, 307, and as the ionizing laser wavelengths.

Image of FIG. 7.
FIG. 7.

(Color online) Comparison of the experimentally measured values of the photoionization cross section from the excited state of the with the existed experimental and theoretical literature. The symbol ● represent the present experimental work, and ×, ⊗, ◆, and 엯 are the experimental results with the respective error bars reported in Refs. 46, 47, 45, and 25, respectively. The continuous curve shows the theoretical calculation of Lahiri and Manson (Ref. 48).


Generic image for table
Table I.

Experimentally determined photoionization cross section of the lithium isotopes from the excited states as a function of the photon energy.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Laser isotope separation of lithium by two-step photoionization