 Solution

ID: past-exam-of-the-chemistry-a-course-of-the-university-of-cambridge/2021/paper-1/a1/b/i/solution

It represents the squared orbital angular momentum. In atomic units,

ℏ = 1

, so its eigenvalues are

l (l + 1)

. In ordinary units the corresponding observable is

ℏ^{2} l (l + 1)

l = 0, 1, 2, \dots

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