A study of isotopically selective photoionization of ytterbium atoms for laser isotope separation

Borisov, S. K.; Kuzmina, Marina A.; Mishin, V. A.

doi:10.1007/bf02073528

Cited by 20 publications

(21 citation statements)

References 3 publications

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“…These values also are compared with the reported standard values in the literature. 20,22 The isotopic shifts estimated from pulsed laser measurements differ from the standard results. This finding is as expected as the isotopic peaks in the observed experimental OG spectrum are not very sharp due to the effect of pulsed laser linewidth and Doppler broadening of Yb atomic transition.…”

Section: Resultsmentioning

confidence: 77%

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Studies on the Optogalvanic Effect and Isotope-Selective Excitation of Ytterbium in a Hollow Cathode Discharge Lamp Using a Pulsed Dye Laser

Kumar

Prakash

et al. 2013

Appl Spectrosc

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This paper presents studies on the pulsed optogalvanic effect and isotope-selective excitation of Yb 555.648 nm (0 cm(-1) → 17 992.007 cm(-1)) and 581.067 nm (17 992.007 cm(-1) → 35 196.98 cm(-1)) transitions, in a Yb/Ne hollow cathode lamp. The Yb atoms were excited by narrow linewidth (500-1000 MHz) Rh110 and Rh6G dye based pulsed lasers. Optogalvanic signal inversion for ground state transition at 555.648 nm was observed beyond a hollow cathode discharge current of 8.5 mA, in contrast to normal optogalvanic signal at 581.067 nm up to maximum current of 14 mA. The isotope-selective excitation studies of Yb were carried out by recording Doppler limited optogalvanic signals as a function of dye laser wavelength. For the 581.067 nm transition, three even isotopes, (172)Yb, (174)Yb, and (176)Yb, and one odd isotope, (171)Yb, were clearly resolved. These data were compared with selective isotope excitation by 10 MHz linewidth continuous-wave dye laser. For 555.648 nm transition, isotopes were not clearly resolved, although isotope peaks of low modulation were observed.

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Section: Resultsmentioning

confidence: 77%

“…However, in the reported literature, well-resolved spectra of Yb isotopes using atomic beam fluorescence spectroscopy by an ultra narrow linewidth (<10 MHz) CW dye laser are available. 21,22…”

Section: Resultsmentioning

confidence: 99%

Studies on the Optogalvanic Effect and Isotope-Selective Excitation of Ytterbium in a Hollow Cathode Discharge Lamp Using a Pulsed Dye Laser

Kumar

Prakash

et al. 2013

Appl Spectrosc

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“…This three-step photoionization scheme was also used to conduct the Yb LIS experiments by other researchers. [14][15][16][17][18] The natural abundances, nuclear spins and isotope shifts of ytterbium isotopes are list in Table 1, where all of the isotope shifts are relative to 176 Yb, and the number in bracket is the atomic angular momentum quantum number. All even isotopes do not have hyperfine splitting, while 171 Yb and 173 Yb with non-zero nuclear spins own hyperfine structures for both excited states.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the laser isotope separation (LIS) method is the only option for economic ytterbium isotope separation. [14][15][16][17][18] Basically, the LIS method is based on isotopic selective photoionization of atomic vapors under several narrowbandwidth laser pulses. Target isotopes are excited and ionized resonantly, while non-target isotopes are ionized barely due to the isotope shifts.…”

Section: Introductionmentioning

confidence: 99%

Numerical studies of isotopic selective photoionization of ytterbium in a three-step ionization scheme

Liu¹,

Wang²

2023

Chinese Phys. B

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Numerical studies of selective photoionization of ytterbium isotope have been carried out based on a three-step photoionization scheme, 4f 146s 2 1S0 (0 cm-1) → 4f 146s6p 3P1 (17992.008 cm-1) → (4f 136s 26p) (7/2, 3/2)2 (35196.98 cm-1) → auto-ionization state (52353 cm-1) → Yb+, by the density matrix theory with the consideration of atomic hyperfine structures and magnetic sublevels. To examine the physical model, the numerical isotopic abundances of ytterbium are compared with those of mass spectroscopy experiments and good agreements are acquired. The excitation and ionization processes of ytterbium are discussed and analyzed in detail on this basis, especially for odd isotopes. The effects of frequency detuning, power densities, spectral bandwidths, polarization of two excitation lasers and atomic Doppler broadening on the total ionization yield and isotopic abundance are presented numerically and the optimization excitation conditions for 176Yb enrichment are identified semi-quantitatively.

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“…One example is highresolution ultraviolet or vacuum ultraviolet spectroscopy [206,207] where second-harmonic generation 1 (SHG) or four-wave mixing is needed to produce the appropriate wavelengths. A second example is laser isotope separation [207,209,210] where the yield depends on intensity but resolution is essential due to the smallness of isotope shifts. Generally speaking, high power and high resolution are mutually exclusive; the former belongs to the realm of pulsed lasers, the latter to the continuous-wave (cw) light sources.…”

Section: Introductionmentioning

confidence: 99%

Multiple light scattering in porous gallium phosphide

Bret

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where E i and I i are respectively the field and intensity of light propagating only along the path i. The sum of intensities along all the paths leads to the diffusion result, as in Eq. 1.3. The interference term can not in practice be calculated for a single configuration of the distribution of scatterers, but statistical properties (intensity distributions or spatial correlations for example) can be derived [12-15]. where the ensemble-average of fields from path j i, i * is 0 for independent scatterers. The fields from the time-reversed paths i and i * are equal, provided the time-reversal symmetry is not broken [17]. Time-reversed paths always interfere constructively, and therefore double the intensity of light returning to the origin A, compared to the case when no interference is present. If the point A is not inside the multiple-scattering medium, but is outside, in the far field, the factor 2 increase in intensity of I A→A compared to I A→B leads to the so-called coherent or enhanced backscattering (EBS). In the exact backscattered direction, where the incident and outgoing wave vectors are opposite, the interference of the time-reversed paths is fully constructive and the intensity is twice the diffusion expectation. In practice, the EBS is a cone of light, on top of the diffuse background, as showed in Fig. 1.3b. At exact backscattering (in the center of Fig. 1.3b), a multiple-scattering sample reflects up to twice as much intensity as outside the EBS cone. The EBS cone is characteristic of the multiple scattering of waves, and its width is related to the two length scales involved, and λ respectively, as λ/. The EBS cone is fully derived and described in section 2.6. 1.2.3 Anderson localization The constructive interference of time-reversed paths leads to a more dramatic effect than the EBS. The higher intensity I A→A compared to I A→B means that the probability of a photon

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A study of isotopically selective photoionization of ytterbium atoms for laser isotope separation

Cited by 20 publications

References 3 publications

Studies on the Optogalvanic Effect and Isotope-Selective Excitation of Ytterbium in a Hollow Cathode Discharge Lamp Using a Pulsed Dye Laser

Studies on the Optogalvanic Effect and Isotope-Selective Excitation of Ytterbium in a Hollow Cathode Discharge Lamp Using a Pulsed Dye Laser

Numerical studies of isotopic selective photoionization of ytterbium in a three-step ionization scheme

Multiple light scattering in porous gallium phosphide

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