Abstract
Parametric dependence of the intensity of 182 Å Balmer-α line (C5+; n = 3 → 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 × 1013 W cm−2. At this laser intensity, the space resolved measurements show that the spectral intensity of this line peaks at ∼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 → 1) line, it is inferred that n = 3 state of C5+ ions is predominantly populated through three-body recombination pumping of C6+ ions of the expanding plasma consistent with quantitative estimates on recombination rates of different processes.
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Chowdhury, A., Joshi, R.A., Naik, P.A. et al. Optimization of C5+ Balmer-α line intensity at 182 Å from laser-produced carbon plasma. Pramana - J Phys 68, 43–49 (2007). https://doi.org/10.1007/s12043-007-0004-x
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DOI: https://doi.org/10.1007/s12043-007-0004-x