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seen Feb 3 at 21:59

Chemistry. Undergraduate.


Feb
3
comment What does it mean that the Higgs has a nonzero vacuum expectation value?
That there is a probability for a particle to "emerge" out of the vaccuum?
Jan
30
comment Probability current density : Isn't there something wrong with this proof?
Griffith's 2nd Ed problem 1.14.
Nov
18
awarded  Popular Question
Oct
23
awarded  Scholar
Oct
23
accepted Determining Fourier Coefficients by inspection
Oct
22
comment Determining Fourier Coefficients by inspection
The transform I get is in terms of exponentials while my teacher says we should get Dirac Deltas. He told us this comes from the fact that there are "obvious" boundary conditions our transform has to meet.
Oct
21
asked Determining Fourier Coefficients by inspection
Oct
21
comment Jacobian, Lorentz and Fourier Transformation
Clear and to the point. Thanks.
Sep
29
comment Wavefunction normalization
So when Marder (Condensed Matter Physics, 2nd) writes that solutions of the free-particle Schrödinger equation are $$\Psi_{\vec{k}} = \frac{1}{\sqrt{V}}\mathrm{e}^{\mathrm{i}\vec{k}\cdot\vec{r}}$$ he implies that we'll be using LCs of them? Or is it an error? $$\left[\frac{\vec{r}}{V}\right]_{-\infty}^\infty$$ is either indefinite or infinity. He states that the plane wave solutions are normalized, which bothers me... maybe I'm missing something in his argument.
Sep
3
comment Why is a nucleus isotropic?
Which is exactly what he meant. $360 \equiv 0\ \text{mod}\ 360$. So in your example $1080 \equiv 360\ \text{mod}\ 360$
Sep
1
awarded  Altruist
Sep
1
answered Where can a good treatment of the 'sudden' perturbation approximation be found?
Aug
31
awarded  Citizen Patrol
Aug
27
awarded  Excavator
Aug
27
comment Where can a good treatment of the 'sudden' perturbation approximation be found?
@RonMaimon I've asked a related question here, if you're interested. I thought this question should deserve its own answer, since only a comment was posted!
Aug
27
awarded  Organizer
Aug
27
revised Where can a good treatment of the 'sudden' perturbation approximation be found?
Cleaned up the question in line with my bounty offer.
Aug
26
suggested suggested edit on Where can a good treatment of the 'sudden' perturbation approximation be found?
Aug
26
awarded  Investor
Aug
7
comment Time-dependence in LCAO
The Hamiltonian I'm really interested into is time-dependent.