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    • Keywords


      Photoexcitation cross-section; resonance ionization mass spectrometry; time-of-flight mass spectrometer; uranium.

    • Abstract


      We report the measurement of photoexcitation cross-sections of three first-step uranium transitions $(0 \rightarrow 16900.38$ cm-1 , $0 \rightarrow 17361.89$ cm-1 and $620 \rightarrow 17361.89$ cm-1) using saturation method. These measurements were performed on a resonance ionization mass spectrometry (RIMS) set-up consisting of Nd:YAG-pumped dye lasers, a reflectron time-of-flight mass spectrometer and high-temperature atomic vapour source. The uranium vapours were excited and photoionized by two-colour, three-photon photoionization scheme using Nd:YAG-pumped dye laser system. The resultant photoion signal was monitored as a function of dye laser fluence used for first step excitation to measure the excitation cross-section values. A new approach was adopted to overcome the large uncertainties associated with such measurements. With this approach the cross-section of transitions whose value is already reported in the literature was measured as a bench mark. By normalizing the measured value to the reported value, a scaling factor was derived. This scaling factor was used to scale up the cross-section values of other transitions measured by this method.

    • Author Affiliations


      M L Shah1 R C Das1 P K Mandal1 D R Rathod1 Vas Dev1 K G Manohar1 B M Suri1

      1. Laser & Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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