A SIMION ION file defines a list of particles. It is a text file in the comma-separate-value (CVS) format, with one particle per row. ION files are easy to create from external programs. ION files are more general than the FLY_File.

Each row for a particle has the following parameters separated with commas:

TOB, Mass, Charge, X, Y, Z, AZ, EL, KE,  CWF, Color
 0,  100,  1,      0, 0, 0, 0,  0,  0.1, 1,   0

The row below contains the default values for each.

• TOB: Time of birth in microseconds.
• Mass: In atomic mass units.
• Charge:
• X:
• Y:
• Z:
• AZ: Azimuth angle.
• EL: Elevation angle.
• KE: Initial kinetic energy.
• CWF: Charge weight factor
• Color: between 0-15.

See also Particle Initial Conditions.