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Problem 1. Determine the angular momentum, the z-component of the angular momentum, and the energy of...
calculate the angles which the angular momentum vector forms with the z-axis in some 3 states...
calculate the angles which the angular momentum vector forms with the z-axis in some 3 states of a particle on a sphere described by spherical harmonics Y2,2, Y2,-1, Y2-0
Molecular Rotations a. The wavefunction of rotations of diatomic molecules according to the rigid rotor approximation...
Molecular Rotations a. The wavefunction of rotations of diatomic molecules according to the rigid rotor approximation are spherical harmonics. Where have you seen spherical harmonics before? What are the quantum numbers that specify the wavefunctions for the rotational quantum states of a diatomic molecule? b. What are the gross and specific selection rules for pure rotational spectroscopy of a diatomic molecule? What region of the spectrum is used spectroscopy? What are the rotational energy levels for diatomic molecules and spherical...
Rotational states of a diatomic molecule can be approximated by those of a rigid rotor. The hamil...
Rotational states of a diatomic molecule can be approximated by those of a rigid rotor. The hamiltonian of a rigid rotor is given by hrotor 12/21, where L2 is the operator for square of angular momentum and I the moment of inertia. The eigenvalues and eigenfunctions of L2 are known: Lylnu =t(1+1)ay," , where m.--1, , +1 a) Calculate the canonical partition function : of a rigid rotor. Hint: Replace summation over by integral. b) What is the probability that...
Physical Chemistry Problem: Evaluate the average z-component of the angular momentum of a particle on a...
Physical Chemistry Problem: Evaluate the average z-component of the angular momentum of a particle on a ring that is described by the (unnormalized) wavefunctions (a) e^–2iψ, (c) cos ψ, and (c) (cos χ)e^iψ + (sin χ)e^–iψ. (note - cos χ and sin χ are just weighting coefficients, ie constants)
(V.4) A particle is observed to have orbital angular momentum quantum number 2. The z component...
(V.4) A particle is observed to have orbital angular momentum quantum number 2. The z component of the angular momentum is measured to be Lz2h. A second particle is observed to have orbital angular momentum quantum number l2-2 and a z component ha = +2 V1(1 +1), what are the possible outcomes, and with what relative probabilities? What is the expectation value (L)'? h. If a measurement is made of the total angular momentum L-h
Learning Goal: To learn the definition andapplications of angular momentum including its relationship totorque. By...
Learning Goal: To learn the definition andapplications of angular momentum including its relationship totorque. By now, you should be familiar with the concept ofmomentum, defined as the product of an object's mass andits velocity: . You may have noticed that nearly every translationalconcept or equation seems to have an analogous rotationalone. So, what might be the rotational analogue of momentum? Just as the rotational analogue of force , called thetorque , isdefined by the formula , the rotational analogue of...
3. Consider a rigid rotor whose Hamiltonian is given by H L2(21) where L is the angular momentum operator and I is the...
3. Consider a rigid rotor whose Hamiltonian is given by H L2(21) where L is the angular momentum operator and I is the moment of inertia of the rotator. Its rotation is described by a wave function: (0, N{Yo0(0,6)(1 3i) Y1-1(0,6) 2 Y21(0.0) Y20(0.) Find the normalization constant, N. (i) Find the probability to occupy state Yo0- (ii Find the expectation value of L2 of this state (iii Find the expectation value of L2 of this state (iv) Find (L2L2/21...
Problem 1. (20 points) Consider two electrons, each with spin angular momentum s,-1/2 and orbital angular momentum ,-1....
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...
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...
The orbital quantum number 1 determines the (a) direction of the electron's orbital angular momentum, (b)...
The orbital quantum number 1 determines the (a) direction of the electron's orbital angular momentum, (b) z-component of the electron's angular momentum, (c) magnitude of the electron's spin, (d) magnitude of the electron's orbital angular momentum.
Molecular Rotations a. The wavefunction of rotations of diatomic molecules according to the rigid rotor approximation are spherical harmonics. Where have you seen spherical harmonics before? What are the quantum numbers that specify the wavefunctions for the rotational quantum states of a diatomic molecule? b. What are the gross and specific selection rules for pure rotational spectroscopy of a diatomic molecule? What region of the spectrum is used spectroscopy? What are the rotational energy levels for diatomic molecules and spherical...
Rotational states of a diatomic molecule can be approximated by those of a rigid rotor. The hamiltonian of a rigid rotor is given by hrotor 12/21, where L2 is the operator for square of angular momentum and I the moment of inertia. The eigenvalues and eigenfunctions of L2 are known: Lylnu =t(1+1)ay," , where m.--1, , +1 a) Calculate the canonical partition function : of a rigid rotor. Hint: Replace summation over by integral. b) What is the probability that...
(V.4) A particle is observed to have orbital angular momentum quantum number 2. The z component of the angular momentum is measured to be Lz2h. A second particle is observed to have orbital angular momentum quantum number l2-2 and a z component ha = +2 V1(1 +1), what are the possible outcomes, and with what relative probabilities? What is the expectation value (L)'? h. If a measurement is made of the total angular momentum L-h
3. Consider a rigid rotor whose Hamiltonian is given by H L2(21) where L is the angular momentum operator and I is the moment of inertia of the rotator. Its rotation is described by a wave function: (0, N{Yo0(0,6)(1 3i) Y1-1(0,6) 2 Y21(0.0) Y20(0.) Find the normalization constant, N. (i) Find the probability to occupy state Yo0- (ii Find the expectation value of L2 of this state (iii Find the expectation value of L2 of this state (iv) Find (L2L2/21...
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...
The orbital quantum number 1 determines the (a) direction of the electron's orbital angular momentum, (b) z-component of the electron's angular momentum, (c) magnitude of the electron's spin, (d) magnitude of the electron's orbital angular momentum.
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