  The wavelengths and radiative transition probabilities for transitions
2lnl'-1snl", 2lnl'-1s2l", 1s2lnl'-1s^2.nl", 1s2lnl'-1s^2.2l", and the
autoionization decay probabilities for doubly excited states 2lnl', 1s2lnl'
were calculated in ions with atomic numbers Z=6-36 for n=2-10, l'=0-3. The
calculations were carried out by means of the MZ code based on the Z-expansion
method. Relativistic corrections were taken into account within the framework
of the Breit operator. The main difference with previous calculations by MZ
code consists in accounting for the first order corrections in powers of 1/Z,
corresponding to the screening effects, in calculations of autoionization
rates. New data for comparatively large rates are about 20-50% less as compared
to previous ones and are in a agreement within 10% with the results of
calculations made by the methods based on multi-configuration wave functions
with non-relativistic and relativistic orbitals. Some refinements and
corrections concerning the energies and radiative transition probabilities were
also introduced in the MZ code. In this paper the main formulas used in a
modified MZ-code and the data needed for description of dielectronic satellites
with n=2,3 are given; the data for higher n will be presented in the following
publications.
