• Optimization of C5+ Balmer-𝛼 line intensity at 182 Å from laser-produced carbon plasma

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      https://www.ias.ac.in/article/fulltext/pram/068/01/0043-0049

    • Keywords

       

      xuv-spectroscopy; laser-produced plasma; flat-field grating spectrograph; Nd:phosphate glass laser.

    • Abstract

       

      Parametric dependence of the intensity of 182 Å Balmer-𝛼 line $(C^{5+}; n = 3 \rightarrow 2)$, relevant to xuv soft X-ray lasing schemes, from laser-produced carbon plasma is studied in circular spot focusing geometry using a flat field grating spectrograph. The maximum spectral intensity for this line in space integrated mode occurred at a laser intensity of $1.2 \times 10^{13}$ W cm-2. At this laser intensity, the space resolved measurements show that the spectral intensity of this line peaks at $\sim 1.5$ mm from the target surface indicating the maximum population of C5+ ions $(n = 3)$, at this distance. From a comparison of spatial intensity variation of this line with that of C5+ Ly-𝛼 $(n = 2 \rightarrow 1)$ line, it is inferred that $n = 3$ state of C5+ ions is predominantly populated through three-body recombination pumping of C$^{6+}$ ions of the expanding plasma consistent with quantitative estimates on recombination rates of different processes.

    • Author Affiliations

       

      A Chowdhury1 R A Joshi1 P A Naik1 P D Gupta1

      1. Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India
    • Dates

       
  • Pramana – Journal of Physics | News

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