This is a stupid question, but I'm trying to understand some spectroscopic data from the NIST website.
Can anyone tell me what the roman numerals mean? E.g. when they gives lines for Neon as: Ne I or Ne IV, what do the I and IV mean?
Thanks for any help!
Thanks for showing me the question wasn't clear.
I'm looking into resistive plate chambers, and am trying to get a feeling for how to design the resistivity of the plate.
In RPCs, like in Geiger counters, the detectors undergoes a discharge whenever a charged particle traverses the active...
Hi All,
I'm designing an experiment and want to estimate the holding current (minimal current to maintain a spark) for my setup.
Does anyone know how to calculate the holding current? I imagine it should depend on gas mixture, pressure, temperature.
A reference to a book/article...
Thanks for the reply. Actually I was referring to the average occupation. In the non-interacting case
n=(e^{\beta (\epsilon -\mu)}+1)^{-1}
In the interacting case it is not so simple. But this relationship was stated. I think it has to do with the spectral function.
Thanks again for...
Hello everyone,
In Fermi Liquid Theory, I'm trying to understand what the relationship is between the Green's function and the average occupancy of levels. In my lecture they gave the relation
\left\langle n_k \right\rangle = G(k,\tau\rightarrow 0^+)
Anyone know where this comes from...
Notice that in equation (3) you have the parameter 1/T, this is exactly what equation (4) is telling you. Try substituting (4) into (3) and seeing if you get the right solution.
This isn't exactly a physics question, but oh well.
I was recently looking through some old physics papers (from 50s and 60s) and really enjoyed the way their equations looked.
Does anyone know if these Greek and mathematical symobl fonts are available?
What are they called?
Thanks
Hi all,
I know that the photon has spin 1. Does its magnetic number, the m in | \ell m \rangle imply its polarization? For instance if m=1, does that mean it has circular polarization?
Personally I see no connection between the two.
Thanks for any help.
I'm trying to understand the relationship between conserved charges and how operators transform. I know that we can find conserved charges from Noether's theorem. If (for internal symmetries) I call them Q^a = \int d^3x \frac{\partial L}{\partial \partial_0 \phi_i} \Delta \phi_i^a then is it...
Sorry I still don't understand. Each (j,j') is a (2j+1)X(2j'+1) dimensional vector space. So in the case of (1/2,1)\oplus(1,1/2) it should be a twelve dimensional vector space. What you wrote is five dimensional. Maybe the answer is A_{2\times2}\otimes 1_{3\times3} \oplus A_{3\times3}\otimes...
Thanks for the quick reply. But I didn't understand. In the (1/2,1)\oplus(1,1/2) of Lorentz, does the operator A (the left SU(2)) look like this
\begin{pmatrix}
A_{2\times2} & 0 & 0 & 0 \\
0 & 1_{3\times3} & 0 & 0 \\
0 & 0 & A_{3\times3} & 0 \\
0 & 0 & 0 & 1_{2\times2}
\end{pmatrix}
Hello All,
I'm trying to understand how the (j,j') representation of the Lorentz group. Following Ryder, I can see why we define A=J+iK and B=J-iK, which each form an SU(2) group. So it's clear to me what the rep of these generators is when acting on a state (j,j'): Rep(A)\otimes1+1\otimes...
Thanks!
So if I understand correctly, there's a big jump in energy between a full p shell and the next s shell.
Madelung's rule applies to ordering the subshells in terms of their energy for increasing atomic number (and increasing number of electrons). But the question here is more about...
That's a throwback to the original question.
If all subshells are spherically symmetric and stable, what makes p a special subshell, that when it gets filled the element is inert?