Problem 3 Consider a particle with total angular momentum quantum number l (1) Write down the...
4. If the general angular momentum quantum number j is 1 there is a triplet of |j, mj) states 1,1, 1,0), and 1,-1) In this case a matrix representation for the operators J, Jj and J, can be constructed if we represent the lj,m,) triplet by three component column vectors as follows 0 0 0 0 0 Jz can then be represented by the matrix: 00 1 (a) Construct matrix representations for the raising and lowering operators, J and J...
Problem 1. (20 points) Consider two electrons, each with spin angular momentum s,-1/2 and orbital angular momentum ,-1. (a) (3 points) What are the possible values of the quantum number L for the total orbital angular momentum L-L+L,? (b) ( 2 points) What are the possible values of the quantum number S for the total spin angular momentum S-S,+S, (c) Points) Using the results from (a) and (b), find the possible quantum number J for the total angular momentum J-L+S....
3 Angular Momentum and Spherical Harmonics For a quantum mechanical system that is able to rotate in 3D, one can always define a set of angular momentum operators J. Jy, J., often collectively written as a vector J. They must satisfy the commutation relations (, ] = ihſ, , Îu] = ihſ, J., ſu] = ihỈy. (1) In a more condensed notation, we may write [1,1]] = Žiheikh, i, j= 1,2,3 k=1 Here we've used the Levi-Civita symbol, defined as...
System A consists of two spin-1/2 particles, and has a four-dimensional Hilbert space. 1. Write down a basis for the Hilbert space of two spin-1/2 particles. 2. Calculate the matrix of the angular momentum operator, Sfot = (ŜA, ŠA, ŜA) for system A, in the basis of question 4A.1, and express them in this basis. 3. Calculate the square of the total angular momentum of system A , Spotl?, and express this operator in the basis of question 4A.1. 4....
HW12.2 (3 points) [1,1],[1,0),[1,-1) are the three eigenstates of Lạ& Ly with quantum number l = 1 and m = 1,0,-1, respectively. a) (1 point) What are the following states Lx|1,1) =? Lx|1,0) = ? Lx|1, -1) = ? b) (1 point) Find out eigenstates of Lx that are linear combinations of (1,1),(1,0), and (1,-1) What is the corresponding eigenvalue for each of the eigenstate you find? c) (1 point) What is the matrix representation of Lx in the basis...
(a) Use the states with total angular momentum 1-1, |1,1), |1,0), and 3. |1,-1), as a basis. Express L as a 3 x 3 matrix. (Ans: (b) Find the eigenvalues of L. (Ans: h, 0, -h.) (c) Express the corresponding eigenstates of L in terms of the states 1,1), |1,0), and |1,-1). (Ans: For eigenvalue h, the eigenstate is (1, 1) + V21,0) + 1, -1))/2. For eigenvalue 0, the eigenstate is (1, 1)-|1,-1))/V2. For eigenvalue -h, the eigenstate is...
3. Poisson brackets Write down the Poisson brackets between the angular momentum L Fxp and an arbitrary vector field that depends on the position and momentum AF, p). Explain which calculation rules for the Poisson brackets can be used to calculate Poisson brackets between vector quanti ties Using this relation calculate the following Poisson brackets a) Li, r} b) {Li, Pj} e) Li, Lj} Hint: Use the expression Li (Fxp) = eijkrjPk for the components of the angular momentum. (Note...
Problem N° 1 114 points] Consider two spinless particles with orbital angular momenta quantum numbers l-1 and 122. If the state of the two- particle system is described by the wave function 4 (a). Find the constant A 12 points]. (b). Find the probability that, as a result of a measurement, the system is found in a state of the form |1 1>121>112 points). Problem N° 1 114 points] Consider two spinless particles with orbital angular momenta quantum numbers l-1...
Consider a perturbed particle in a box, with potential energy: for x <-L/2 2brx/L for -1/2sxSL2 for x >L/2 nd confining the zero order functions to n-1,2, 3, 4 (i.e. the lowest four Using Matrix algebra, and confining the zero order functions to n solutions to the unperturbed particle in a box problem) determine the energy of the l (Hint: In diagonalizing a matrix, you may reorder the quantum numbers in any way you like). d) Consider a perturbed particle...