  K-line profiles emitted from a warm dense plasma environment are used for
diagnostics of Ar droplet plasmas created by high energy laser pulses. We
observe temperature gradients within the Ar droplet from cold temperatures of
the order of some 10 eV up to higher temperatures of about 170 eV.
Non-perturbative wave functions are calculated as well as ionization energies,
binding energies and relevant emission energies using a chemical {\it ab
initio} code. The plasma screening is considered within a perturbative approach
to the Hamiltonian. The plasma effect influences the many-particle system
resulting in energy shifts due to electron-ion and electron-electron
interaction. With this approach we get a good reproduction of spectral features
that are strongly influenced by ionization and excitation processes within the
plasma. Comparing with the widely known FLYCHK code, counting for internal
degrees of freedom (bound states) and treating pressure ionization within our
quantum statistical approach leads to different results for the inferred
temperature distribution.
