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X-ray spectroscopy; K-shell spectra; plasma diagnostics; ionic line radiation.

Spectral analysis of K-shell X-ray emission of magnesium plasma, produced by laser pulses of 45 fs duration, focussed up to an intensity of ∼10¹⁸ W cm^-2, is carried out. The plasma conditions prevalent during the emission of X-ray spectrum were identified by comparing the experimental spectra with the synthetic spectra generated using the spectroscopic code Prism-SPECT. It is observed that He-like resonance line emission occurs from the plasma region having sub-critical density, whereas K-𝛼 emission arises from the bulk solid heated to a temperature of 10 eV by the impact of hot electrons. K-𝛼 line from Be-like ions was used to estimate the hot electron temperature. A power law fit to the electron temperature showed a scaling of $I^{0.47}$ with laser intensity.

V Arora¹ U Chakravarty¹ Manoranjan P Singh¹ J A Chakera¹ P A Naik¹ P D Gupta¹

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

Published

February 2014

Early published

6 February 2014