Discussion  Fr 29.05.2009 at 12:15,  PK 11.2

Home work 7            Period 1 diatomic molecules.

 
Exercise 1:  Bonding energy

Consider the following Period I diatomic molecules and molecular ions: H₂⁺ ,  H₂ ,  He₂⁺ ,  He₂.  Which of these molecule are stable and which are not stable? Why? Place the molecules one after another in the order of  increasing of their bonding energy.

Exercise 2:  Symmetry of  the molecular orbitals

Consider the molecular ion He₂⁺.   Present the total electronic molecular function as a product of  three one-electron wave functions and answer the following questions:

1. Is the total molecular electronic wave function of the σ type, or not?

2. Is the total molecular electronic wave function possesses gerade (g), or ungerade (u) symmetry?

3. What is the total electronic spin S of the molecule?

Explain your answers. 

Exercise 3:  Molecular excited states

Draw the first two one-electron energy levels of the hydrogen molecule H₂  and show the electronic configuration of the ground state of the molecule as a whole.  Transfer one of the molecular electrons from the first energy level to the second  energy level. Write down the obtained electron configuration which corresponds to the excited H₂ molecule.  Answer the questions of  the Exercise 2.  Is the obtained excited state stable, or not? Why?

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