The Chianti atomic database can calculate electron collisional rates for ions as a function of the plasma temperature - would this help? For example, the attached plot shows the collision rate for He II 303.781Angstrom line. If this does help I can send you my code to calculate this (it uses the Chianti database and Chianti routines in IDL). Alternatively, I'm sure there are inbuilt Chianti routines to plot directly.

In calculating the collision rate, I'm sure it must have the impact width in the database (or cross-section - are we talking about the same parameter?).

Do you mean the cross section? For which process? Have you looked into the ADAS or NIFS data basis? see for example https://www-amdis.iaea.org/ALADDIN/

What do you mean 'electron width PARAMETER'?  Width implies that you have a spectral line. This has a) a natural width,  and b) in a medium such as a gas or plasma it also has a Doppler and pressure (Stark or collisional) width, which depends on the line and medium (e.g. temperature, density etc). When you say 'electron' I assume you are talking about a plasma, hence you mean Stark width. This in turn is caused by electrons and ions. For some reason you think that for the line of interest, which you do not specify and plasma conditions, you can neglect ionic contributions. If  you are sure that this is what you want,  then  if you have a isolated line you need dipole matrix elements  between the states involved in the line and all states that appreciably dipole-perturb them and are close enough energetically and a formula that you can look up in Hans Griem's books. If you have overlapping lines, you more or less need the same formula, but you need to essentially invert a matrix(though numerically you do it much more efficiently)