In this section you will calculate the wavefunction of a H_{4} clusters.

**Exercise 1**:
Start DLVisualize,
run a CRYSTAL calculation for the cyclic case:
H4_cyclic.inp

**Exercise 2**:
Run a CRYSTAL properties calculation of the energy level diagram

for the H_{4} cyclic cluster
using the Band Structure module, as explained in **Exercise 2**
for H_{4}.

**Exercise 3**:
Run a CRYSTAL properties calculation of the density of states

for the H_{4} cyclic cluster, as explained in **Exercise 3**
for H_{4}.

**Exercise 4**:
Run a CRYSTAL properties calculation of the
energy level diagram + the density of states

for the H_{4} cyclic cluster,
as explained in **Exercise 4**
for H_{4}.