If the spin of the electrons in the excited state are parallel, it is called as:
Show Hint
- Doublet state
- Triplet state
- Singlet state
- Parallel state
The Correct Option is B
Solution and Explanation
Step 1: Understanding electronic spin states. When an electron in a molecule or atom gets excited, it moves to a higher energy level. The total spin of the system determines whether the state is singlet, triplet, or other multiplicities.
Step 2: Characteristics of a triplet state. - In a singlet state, the electron spins are paired (opposite), meaning the total spin quantum number \( S = 0 \).
- In a triplet state, the electron spins are parallel, meaning the total spin quantum number \( S = 1 \).
- The triplet state is lower in energy than the singlet excited state because parallel spins reduce electron repulsion.
Step 3: Why other options are incorrect. - (A) Doublet state: Applies to systems with an unpaired electron, such as free radicals.
- (C) Singlet state: Electrons have paired spins (\( S = 0 \)), not parallel.
- (D) Parallel state: Not a standard term in quantum chemistry.
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