Introduction:
    There are about 1,500 records of relevant data at present. The data are about electron impact ionization of ions with Z less than 30. For some of them the influence of indirect process are included. More information can be found from the reference.
For these data each record includes the following parts:
target particle,
initial degree of ionization,
initial configuration,
final configuration,
the notation of energy level for initial and final state,
the fitting formula,
the output form of the physical quantity, data type,
the precision of the data,
method by which the data are obtained,
the ionization energy( in unit of eV),
serial number of the relevant data and reference.
The information of the term and total angular momentum of the state is presented about the configuration. Sometimes the symbol G is used to represent the ground state. The output form of the physical quantity includes the list of the original data (DP), the display of the fit parameter (EV) and display of the figure of the original data (FIG). The data type includes cross section (XS)(in the unit of cm²), rate coefficient (RC)(cm³/s). The method includes theory (Thr), experiment (EX) and recommendation (RE). In the display of the results the symbol X represents the reduce energy, which is the ratio of the kinetic energy of the incidence electron to the threshold energy. Here T represents the temperature of the electrons (in unit of eV). Clicking 'Data' gives the detail result of the record (in some cases the fitting formula is issued).
Searching can be proceeded by any composition of the five items: element, isoelectronic sequence, initial state, final state and physical quantity selected.
Relevant functions: displaying the original data; calculating with the fitting formula; plotting data with the original data (under construction).
　

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