Recent content by bentzy

Right. Both are based on the motion of (nearly) free electrons (mostly). This is of course known. My question aims at the deeper level of the mechanism itself, which make up the overall picture of transport.

Wiedemann-Franz law is not the mechanism, but, rather, an empirical fact. An empirical law doesn't explain a phenomenon on its basic mechanism/s, but just gives the relation between variables. In other words, it is the result of, not its cause.

What's the mechanism underlying the correlation between electrical & thermal conductivities in metals ?

The issues mentioned in your answer are well known, and don't correspond to what asked. Answers should be relevant to the specific aspects & phenomena in question(s). Thank you for trying. BC

a. We know metals emit EM radiation upon heating or electric current. I'd like to understand more fundamentally how this phenomenon takes place, on the basis of the basis of band structure, and which electrons are involved ? b. Classically, charges emit radiation when accelarating or...

Two questions, where the 1st is related to previous discussion regarding thes couplings: The selection rules for LS coupling is quite clear - it's based on calculating the compatible electric dipole matrix element. However, in the case of jj coupling we end up with different selection rules...

Returning to your previous reply, It seems that my phrasing isn't clear enough, rather than a false premise, since there was no premise in the 1st place. I just tried to point out the difference in the order of adding the various momenta to get to the total J, depending on which interaction...

I'm afraid you don't see the main point in my question, and target something else, despite my additional, emphasizing comment. Pertubation theory is known, this isn't the point. Let me rephrase the question by being concrete & specific: e.g., in the case of light atoms the central force governs...

In other words, why does the stronger interaction precede in the order of addition ?

The difference between light and very heavy atoms reflects itself in these two schemes. My question is why one scheme for the vector sum is necessarily the right & suitable sum model for one case, and the 2nd scheme suits the 2nd case ? In other words, why & how the relative magnitude of the...

Thank you for the discussion so far. Nevertheless, my question regarding the difference in the procedure of addition remained (I've read the ref you quoted), and I'll rephrase it: in LS coupling the Ls/Ss are coupled since due to the relatively strong electric intercation between pairs of Ls or...

I'm not just quoting, I'm working on this. These subscripts are well-known. especially in the context of electronic spectroscopy. You can find this in every advanced book on the subject, e.g., Quantum Physics of atoms, molecules etc, by R Eisberg & R Resnick, and Concepts of Modern Physics...

No, the symbol didn't include n, the main quantum number, which is written in plain script. The 3 is in superscript, and denotes the multiplicity of the state which is 3 in this case (triplet), hence total S of the state is 1 (due to 2S+1=3>>S=1). Are you familiar with the notions of...

Now, regarding your 1st reply: I know about the relative interaction strengths, which is evident from my very question, and I'm afraid you missed my main 2 emphases, and didn't refer or answer them: (a) explaining the alleged contradiction in the term symbol quoted, & (b) why in the case of...

I'll study the reference you quote, but these don't contradict the well-known UV line I'm talking about, and I'm surprised by your wondering. 1st: there's the transition described in my original question, which is allowed by jj-coupling for very heavy atoms, hence 253/7 nm line. 2nd...