What symmetry operation mixes states with different $\ell$ in hydrogen atom?
59313
What symmetry causes the Runge-Lenz vector to be conserved?
25257
How to see if certain representation of $SU(2)$ is symmetric/antisymmetric/mixed?
148088
What is the energy of a superposition of energy eigenstates?
142916
Proton: 2 up, 1 down quark, Neutron: 2 down, 1 up, how can Neutron: proton + electron?
59536
How do you rotate spin of an electron?
141507
Number of different possible values for the total angular momentum quantum number, $j$?
8760
Is the harmonic oscillator potential unique in having equally spaced discrete energy levels?
42020
What is the spin rotation operator for spin > 1/2?
65294
Can an electron be in two places at the same time?
137319
How is the joint state of these qubits derived?
55948
Negative energy levels in the diagram for a hydrogen atom
92548
Creating an arbitrary state of the quantum simple harmonic oscillator
155176
Tensor product vs. Cartesian Product for composite quantum systems
90378
Coherent states of the form $|{-\alpha}\rangle$
103525
Square root of Pauli operators: is there a common convention to define them uniquely?
41016
Principle of Reflection on atomic level
130727
Is there oscillating charge in a hydrogen atom?