Ionization yield of two-step photoionization process in an optically thick atomic medium of barium

Jana, Biswajit; Majumder, A.; Kathar, P. T.; Das, Sudip Kumar; Mago, V. K.

doi:10.1007/s00340-010-4194-4

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…rec If we assume that the electron temperature does not change during photoionization and is equal to the initial temperature e = 0.01 eV, el then the typical time t rec will be » -10 s. 5 This recombination time is five orders of magnitude less than the previous time. Our calculations corresponded to cold plasma conditions.…”

Section: 5mentioning

confidence: 98%

“…3 at the crucible temperature 880 K. In [5], even higher concentrations of barium atoms were obtained than in [4], of the order…”

mentioning

confidence: 93%

“…Its high sensitivity makes it possible to detect individual atoms and molecules [1], its extreme selectivity provides an effective method of isotope separation [2], and the measurement of isotopic shifts and hyperfine structures allows to study the nuclear properties of short-lived radioactive isotopes [3]. Two-step ionization of barium with laser pumping of a strong line « S P ) was implemented in [4,5]. However the currently available tunable laser radiation sources make it possible to implement a two-step process of ionization of barium atoms in relatively inexpensive experimental schemes by pumping the weak intercombination line « S P 0 1 1…”

Section: Introductionmentioning

confidence: 99%

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Two-step photoionization of barium atoms through excited P11,3 levels in optical dense approximation

Kosarev¹

2022

Phys. Scr.

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The kinetics of two-step photoionization of barium atoms through excited P 1 1 , 3 levels was studied by numerical simulation method in the optically dense approximation. The first laser at wavelength λ 1 = 553.5 nm ( λ 1 = 791 nm) pumps transition S 0 1 ↔ P 1 1 ( S 0 1 ↔ P 1 3 ). The second laser with λ 2 = 266 nm ( λ 2 = 310 nm) ionizes atoms from the level P 1 1 ( P 1 3 ). The third probe laser with wavelength λ i = 493.41 nm causes resonant fluorescence of barium ions. It is shown that the metastable D 2 3 from the D 1 , 2 , 3 3 triplet in barium is strongly populated through P 1 1 , 3 levels. Therefore, the applying of the ionizing laser tuned to a continuum from this metastable D 2 3 can yield a significant increase in the ionization efficiency. The laser-induced fluorescence method makes it possible to estimate the photoionization yield of barium ions with an error of up to 8%. The loading rate of the barium ion beam into the ion trap, obtained numerically, is consistent with the experimental data [Opt. Exp. 19(17), 16438 (2011)]. The deceleration of ultracold plasma recombination due to the heating of electrons in superelastic collisions for the characteristic times of a two-stage process is predicted.

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Section: 5mentioning

confidence: 98%

“…3 at the crucible temperature 880 K. In [5], even higher concentrations of barium atoms were obtained than in [4], of the order…”

mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Two-step photoionization of barium atoms through excited P11,3 levels in optical dense approximation

Kosarev¹

2022

Phys. Scr.

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“…It depends on the energy density of laser pulses used for different steps in the interaction region. A code has been developed using rate equations to estimate the ionization yield of the two-step resonant photoionization process in an optically thick medium of Ba for a time-varying Gaussianshaped laser pulse [19]. The absorption of exciting radiation in an optically thick medium is taken into account along its propagation direction whereas the medium is assumed to be optically thin for ionizing radiation.…”

Section: Comparison Of Photoionization Yieldmentioning

confidence: 99%

“…The ion density is also measured using the resonant line of ions in the technique of optical absorption [14] and laser-induced fluorescence [15,16]. Other than that the charge density is also measured by the Langmuir probe method [17,18] and the charge collection method [19]. Since the photoplasma is pulsed in nature and has a finite volume, the total charge collection method is one of the easiest and simplest techniques to measure the photoion density in laser-produced finite-sized photoplasma.…”

Section: Introductionmentioning

confidence: 99%

Measurement of photoionization yield in low-density barium photoplasma study

Jana¹,

Kathar²,

Majumder³

et al. 2013

Meas. Sci. Technol.

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A finite-sized barium (Ba) photoplasma is generated through a two-step resonant photoionization method by shining laser pulses onto an atomic beam of Ba. The photoionization yield is estimated from the ratio of photoion density to neutral atom density measured in the laser–atom interaction region. The neutral atom density in the atomic beam is measured by an optical absorption technique where a Ba hollow cathode lamp (Ba-HCL) is used as an emission source. Since the photoplasma has a finite volume and it is pulsed in nature, the photoion density in the photoplasma is estimated through the collection of charge from the photoplasma. The measured ionization yield is compared with the calculated value that is obtained from an in-house developed code. It is observed that the values are in good agreement.

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Need for enrichment of lutetium isotope and design of a laser based separator module

Majumder,

Pulhani,

Ghosh

et al. 2023

Applied Radiation and Isotopes

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Ionization yield of two-step photoionization process in an optically thick atomic medium of barium

Cited by 8 publications

References 31 publications

Two-step photoionization of barium atoms through excited P11,3 levels in optical dense approximation

Two-step photoionization of barium atoms through excited P11,3 levels in optical dense approximation

Measurement of photoionization yield in low-density barium photoplasma study

Need for enrichment of lutetium isotope and design of a laser based separator module

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