Sir,

Kindly go through attached files. i think these would be positive for you.

Thanking you

Depends what you mean by nitrogen deposition. Molecular nitrogen is 79% of the atmosphere and has a residence time estimated to be of order millions of years. Deposition is not the word here. If you mean reactive nitrogen (NO+NO2+2N2O5+HNO3+PAN) then you have to specify where and when, because in general these species do not have long lifetimes against photochemical reaction, rainout, adsorption on to aerosols etc., and also deposit and react at the surface.

Can you be more specific about what you want to do? 

I'm familiar with how to calculate odd nitrogen oxide formation due to ionization, which is eventually rained out as HNO3.

Reactive nitrogen also includes NH3 and its reaction product NH4+ aerosol. Moreover, also NO3- aerosol. Maybe you could specifiy why you need this information, e.g. the surface for which the deposition should be calculated, if you want to know the deposition around a point source etc.

In general as Anand has provided there are two forms of deposition: dry deposition and wet deposition. Then there are two possibilities for the calculation:

a. Directly/indirectly from measurements

b. Using an atmospheric transport model which includes information on emissions, meteorology, chemistry, surface properties etc. 

Ad a. From measurements:

Whereas wet deposition can be determined relatively easily from measurements, measurements of the dry deposition are very complicated and time consuming. For that reason the dry deposition is often calculated from measured air concentrations and modelled dry deposition velocities, taking the properties of the surface into account.

I attache some files with information on NH3, NH4+ aerosol.