MEASUREMENTS AND SIMULATIONS OF THE INTENSITY AND SHAPE OF THE HYDROGENIC A1 RESONANCE LINE (1S(2)S-2P(2)P) IN LASER-PRODUCED-PLASMAS

The one-dimensional Lagrangian hydrocode MEDUSA has been used to simul ate the time-dependent spectral profile of the (1s(2)S-2p(2)P) line in hydrogenic aluminum in laser irradiated targets. The ionic population s are calculated using a non-LTE average atom model using the escape f actor formulism. A multifrequency line transfer model is then employed to compute the spectral line profile. The simulations show that the l ine shape and position in 1-D planar geometry are strong functions of observation angle, but for a given observation angle the wavelength of the peak emission is insensitive to laser irradiance. This latter res ult is of relevance to proposed photopumped x-ray laser schemes.