# Why do we calculate vertical electronic affinity?

Hello,
I find a expression to calculate vertical electronic affinity I wouled like to know the utility of the latter ?
what is the difference between adiabatic and vertical electronic affinity?
Thank you

fresh_42
Mentor
2021 Award

Hello Yahyaoui Fawzia,

I think it would help if you provided more context and the expression you're talking about. If you need help to type in formulas, please have a look on our LaTeX information page: https://www.physicsforums.com/help/latexhelp/

Lord Jestocost
Gold Member
The terms adiabatic and vertical electron affinity (https://old.iupac.org/reports/1999/7110minkin/e.html#electron_affinity) are also used with respect to the ionization potential or ionization energy (https://old.iupac.org/reports/1999/7110minkin/i.html#ionization_potential). As these are sometimes easier to imagine, the following websites might be of help as a start: