Calculate the 2nd order energy shift to the ground state energy of the one-dimensional harmonic oscillator, when a perturbation of the form H₁ = Є · (²) is added to the original Hamiltonian Ho = p²/2m+ ½ mw²x². Take a ⇒ (ħ/mw) ¹/2, the characteristic length scale of the oscillator. The second order correction to level n is given by E(2) = Σ m#n ||| H₁|v0| |2 m E(0) - EO)
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- b): Consider two identical linear oscillators' having a spring constant k. The interaction potential is H = Ax|X2, where xi and x2 are the coordinates of the oscillators. Obtain the energy eigen values.Legrende polynomials The amplitude of a stray wave is defined by: SO) =x (21+ 1) exp li8,] sen 8, P(cos 8). INO Here e is the scattering angle, / is the angular momentum and 6, is the phase shift produced by the central potential that performs the scattering. The total cross section is: Show that: 'É4+ 1)sen² 8, .For a particle confined on a ring (with periodic boundaries) the appropriate wavefunction ħ? d? Н 2 and Hamiltonian are: ime e 21 dф 2 || me (27)1/2 Determine the energy associated with this system.
- Find the ground state energy using the variational principle for the given Hamiltonian h? d? – y8(y). Use the trial wave function ø(y)= De¯®´ with a as the variational =H 2m dy +00 1 parameter. Hint: y"ea dx = (2a)™-12 r| m+ –my (а) 2h? -2my? (b) 2 -my (c) (d) my? Answer A O B DBThe anharmonic oscillator Hamiltonian is given by H= 2m correction to the energy of the harmonic oscillator, if you now the ground state 7, is kr² 2hw k That Y₁ = (- k+x. Evaluate the 1" order +-Consider the function v(1,2) =( [1s(1) 3s(2) + 3s(1) 1s(2)] [x(1) B(2) + B(1) a(2)] Which of the following statements is incorrect concerning p(1,2) ? a. W(1,2) is normalized. Ob. The function W(1,2) is symmetric with respect to the exchange of the space and the spin coordinates of the two electrons. OC. y(1,2) is an eigenfunction of the reference (or zero-order) Hamiltonian (in which the electron-electron repulsion term is ignored) of Li with eigenvalue = -5 hartree. d. The function y(1,2) is an acceptable wave function to describe the properties of one of the excited states of Lit. Oe. The function 4(1,2) is an eigenfunction of the operator S,(1,2) = S;(1) + S,(2) with eigenvalue zero.
- The Hamiltonian of a relativistic partide can be approximated by. p² H= +V+H} 2m where H³ = - Using first order time-independent perturbation theory. show that the 1 order energy correction is given by E₁= (E²-2E ) where the expectation values are taken the unperturbed (and undegenerate) state P² 2m p4 8m3c2 2mc² 14) + V14>= E|VY with respect to lys that satisfiesCheck if the following operators with the corresponding functions could form an eigen value equations or not (where Bis a constant value) No. function Оperator 3 2 3 sin(ßx) sin(Bx) d dx 4 sin(ßx) dxA nonrelativistic particle of mass m undergoes one-dimensional motion in the potential V (1) = -g|6(x – a) + d (x + a)] whhere g >0 is a constant and 6 (x) is the Dirac: delta function. Find the round-state energy eigenfunction and obtain an equation which relates the I'orresponding energy eigenvalue to the constant g.
- PROBLEM 2. The potential energy of a weakly anharmonic oscillator can be modeled by: m U(x) P²+Bx*, where the last quatric term describes a small anharmonic correction. The energy levels En of the anharmonic oscillator in the first order in the pa- rameter 3 are given by: En = hw 5) + B(n|z*\n). Calculate the energy of the ground state Eo of the anharmonic oscillator.Hamiltonian of an axially symmetric rotator acting on a state |lm) is given by: H = 21 212 where I, and Iz are the moments of inertia and Ly, Ly and L, are components of the angular momentum operator. a) Find expectation values of H. b) In the case of a rigid rotator (i.e., I, = 1½ = I ), find the energy expression and the corresponding degeneracy relations. c) Calculate the orbital quantum number / and the corresponding energy degeneracy of the rotator where the magnitude of the total angular momentum is v30h.The harmonic oscillator eigenfunction ₁(x) = = 4a³\1/4 e-ax²/2, where a = μω ħ (a) Find (x²) for an oscillator in this state, and express your result in terms of u, w, and ħ. 1 (b) In an eigenstate it is always true that (T) = (V) for a harmonic oscillator. If ↑ =-=-=-=A² 2μ 1 and ✩ = µw²x², find (p²) when the system is in the state 1₁ (x). (Note: You can use the result found in part (a), or compute it directly from the form of the operator p.) 2