## Online Computing

Below are some links to online computing resources for calculating plasma properties.

- HEAVY: Cross sections for excitation and charge transfer for collisions between hydrogenic targets and bare ions.
- AAEXCITE: An interface to average approximation cross sections for calculating electron impact cross sections for atomic ions.
- RATES: Results from collisional radiative calculations of plasmas carried out with the Los Alamos modeling codes are available. Interpolations allow the user to obtain total radiated power, average ion charge, and relative ionization populations in a steady state plasma.
- (This resource is currently unavailable.)

LANL: An interface is available to run several Los Alamos atomic physics codes for calculation of atomic structure, electron impact excitation, as well as ionization processes. Since 2010, atomic data sets of argon, chlorine and silicon produced by a group at LANL can be downloaded for all ionization stages.
- FLYCHK: An interface to the FLYCHK code available at NIST, which generates atomic level populations and charge state distributions for low-
*Z* to mid-*Z* elements under NLTE(Non-Local Thermodynamic Equilibrium) conditions.
- FAC (Flexible Atomic Code): A complete set of collisional and radiative data of atoms from
*Z* = 2 (Helium) to *Z* = 14(Silicon).
- TOPS Opacities: An online interface for the calculation of plasma opacities using the TOPS code, which can write to a variety of formats for use in radiation transport codes.
- GRASP2K: A package of programs implementing the fully relativistic multiconfiguration Dirac-Hartree-Fock method.