**Fukui functions**;

**Example:**

Consider the problem of analyzing of the electronic density redistribution when the hydrogen molecule H2 formed from individual atoms H(1) and H(2)?

The problem can be solved the next way:

1. perform three calculations:

- calculation of H2 with the following coordinates:

H1 0 0 0

H2 0 0 0.74

- calculation of individual atom H(1) with the following coordinates:

H1 0 0 0

- calculation of individual atom H(2) with the following coordinates:

H2 0 0 0.74

2. add these three calculation into one document

3. Click the menu

*Tools--> Analyze electronic density*and activate "Advanced" tab in the appeared window

Click the "Add job" button:

4. Now we shall create difference density function from the densities of the H2 molecule and individual H(1), H(2) atoms.

It is the following linear combination: 1.00 * Rho(HH) - 1.00 * Rho(H(1)) - 1.00 *Rho(H(2))

To create it click the "+" button and specify the data as presented on the figure:

After the combination is created press "OK" button

5. Finish! and now we may build both one-dimensional or two-dimensional plot like in the case of Simple function: