Masses and charges of particles.
Three options are available:
All the rays represent electrons.
All the rays represent the same type of particle, in which case the user specifies the atomic mass number (for example 12.0 for atomic carbon or 0.0005486 for an electron) and the charge number (for example +1 for a singly charged positive ion, -1 for an electron or 0 for a neutral particle).
Different rays represent different particles, in which case the charge and mass numbers will be entered later, for example when individual rays or beams are specified. An example of this is given in xmpl2d12.dat. This option is not available for the 'cathode' and 'coefficients' options.
For users who are editing or constructing an 'input data file' without the use of the data-builder -that is, pre-processor:
But Manual editing is certainly not recommended -it is a relic from the time when the databuilder was not available All users are strongly encouraged to use the databuilder, which always gives the correct formats and which has many options for which the formats are not described or easily deduced.
Two letters are entered at the beginning of the line:
'el' all the rays represent electrons.
'co' 'constant mass' -that is, all the rays represent the same type of particle. Then on the next line enter its charge number (for example +1. for a singly charged positive ion) and its atomic mass number (for example 12.0 for atomic carbon).
'va' 'variable' that is, different rays represent different particles.