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oe1(光电查) - 科学论文

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  • A Study of the Kinetic Parameters of Lu Laser Photoionization Scheme

    摘要： Development of the laser photoionization method for obtaining 177Lu radionuclide for a medical purpose requires the knowledge of the light-saturation intensities at each stage of the Lu photoionization scheme (5d6s2 2D3/2?5d6s6p 4F5/2?5d6s7s 4D3/2?(53375 cm–1)), taking into account the used components of the hyperfine structure of transitions. The effective excitation cross sections of various hyperfine transition components for 175Lu, 176Lu, 177Lu, and 177mLu isotopes have been experimentally determined for radiations of pulsed tunable dye lasers pumped by copper-vapor lasers.

    关键词： laser isotope separation,177Lu,hyperfine structure,laser photoionization

    更新于2025-09-23 15:21:01

  • In-source laser photoionization spectroscopy of Bi isotopes: accuracy of the technique and methods of data analysis

    摘要： The in-source laser photoionization spectroscopy was applied to study neutron-deficient Bi isotopes. Data analysis and accuracy-related aspects of this technique are discussed. The accuracy of the peak position evaluation is estimated. An “integration method” for nuclear spin determination in the case of partially resolved hyperfine spectra is discussed in detail.

    关键词： Nuclear charge radii,In-source laser photoionization spectroscopy,Nuclear electromagnetic moments

    更新于2025-09-23 15:21:01

  • Measurement of photoionization cross-section of Li (2p, 3d) excited states using thermionic diode detector

    摘要： Studies on photoionization cross-section measurement of lithium 2p and 3d excited states selectively populated by single and two photons are reported. The photoionization is carried out in a heat-pipe cum thermionic diode detector using nitrogen laser pumped pulsed dye laser. Rhodamine perchlorate (Rh-640) dye is used to generate the desired tunable laser output in the range of 635 to 675 nm. Both, the thermionic diode detector and dye laser are developed in-house. A negative space charge region formed around diode cathode filament is illuminated by dye laser exciting pulse followed by ionizing UV radiation from nitrogen laser. The effect of ionizing laser pulse energy and precise tuning of dye laser on photoionization signal, across 670.780 nm (2S1/2 → 2P1/2,3/2) single-photon transition and 639.145 nm (2S1/2 → 2D3/2,5/2) two-photon transition are studied. The results obtained are compared with model calculations of photoionization signal saturation curve. The ionization cross-section for both the states (2P1/2, 2D5/2) are determined as 15.40 ± 2.8 Mb and 8.04 ± 1.6 Mb, respectively and atomic number density N ～ 5.6 × 10^8 (cm^?3).

    关键词： Dye laser,Photoionization cross-section,Thermionic diode,Heat-pipe,Lithium

    更新于2025-09-19 17:15:36