In the Photoelectron Spectrum of Carbon Disulfide, CS₂, Ionization from the Highest

question 10

Multiple Choice

In the photoelectron spectrum of carbon disulfide, CS₂, ionization from the highest occupied, 1_g, molecular orbital results in little vibrational structure. In contrast, ionization from the next lowest occupied 1_u molecular orbital results in a long vibrational progression in the ₁ symmetric stretching mode of the CS₂⁺ ion. Which of the following descriptions of the bonding in neutral CS₂ best explains these observations?

• A) Both the 1  _g and 1  _u molecular orbitals of CS₂ are non-bonding in character.
• B) The 1  _g molecular orbital of CS₂ is antibonding in character and the 1  _u orbital is non-bonding in character.
• C) The 1  _g molecular orbital of CS₂ is nonbonding in character and the 1  _u orbital is bonding in character.
• D) Both the 1  _g and 1  _u molecular orbitals of CS₂ are antibonding in character.

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