A particle in a central potential has an orbital angular momentum l – 2h aud a spin s = lh. Find the energy levels and degeneracies associated with a spin-orbit interaction term of the form H30 = AL S, where A is a constant.
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- A spin-particle is in the spin state |A), described by the ket 7 i |4) = 5√2 tu) +5√2 tu). (a) Verify that A) is normalised. (b) Using the spinor representation (+₂) = ₁ | +) = √/2₁ 11³) = ₁ 1 +2) = [8] find the values of c₁ and c₂ for which |A) = C₁|1₂) + C₂l+₂). (c) If the observable S₂ is measured in the spin state |A), what values can be obtained and what are their probabilities? (d) Find the expectation value of S₂ in the spin state [A). (e) With reference to the properties of angular momentum, explain briefly how the results of the Stern-Gerlach experiment provide evidence of the existence of spin.Prove the angular momentum of a single electron..How would you write an N-electron Slater determinant using N atomic spinorbitals χi (x1).
- Rewrite S₁ S₂ in terms of S², |S₁|², 5₂|² by using the identity |S² = |S₁ + S₂|² = |S₁|² + |5₂|² +25₁ · 5₂. Use this to show that the combined spin angular momentum basis 5² for the electron and proton spins is an eigenstate basis for this dipole interaction.In a particular state of the hydrogen atom, the angle between the angular momentum vector L →and the z-axis is u = 26.6°. If this is the smallest angle for this particular value of the orbital quantum number l, what is l?Consider an electron in an external magnetic field in the SzS-direction, $\mathbf{B} B_z \hat{k}S. If the initial spin state of the electron is the eigenstate of SS_x$ with eigenvalue S+\hbar/2$, \begin{enumerate} \item[a)] Find the state of the system at time St$. \item [b)] Show that the system returns to its initial state and calculate the angular frequency. \item [c)] Calculates the expected value of SS_XS, SS_yS and SS_ZS as a function of time. \ end {enumerate}