# 3. The trihydrogen cation, H3, has been experimentally observed, but its geometry is the subject of...

###### Question:

3. The trihydrogen cation, H3, has been experimentally observed, but its geometry is the subject of some controversy. The two most commonly proposed structures are linear or cyclic, as shown in the figure here: a. Construct an MO diagram for linear H3. Use the D2h point group to identify the symmetry of each atomic orbital, group orbital, and molecular orbital. Include a sketch of each MO in your diagram. b. Construct a modified MO diagram for cyclic H3t. Use the D3h point group to determine the symmetry of the three MOs for cyclic H3 (Note: Here our process for determining group orbital symmetry can be used to determine the symmetry of each MO). Order these MOs from low to high energy, and include a sketch of each MO. c. Compare your two MO diagrams. Which structure do you think most closely matches the true geometry of H3*? Explain your choice.

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