Recent content by assed

Oh...so all you are worried about is nomenclature. Call it what you want, I call a conservative force a force that results in conservation of energy and one necessary condition is that it can be written a the gradient of a time-independent scalar function.

Yes, Cofee_ you are right. the case mentioned by AlephNumbers does not fit your case. Answering your question, a conservative force is related to a time independent potential because if that is not the case energy is not conserved. Take a look at this ...

You don't need to write a generic state. The problem asks about a transition from 1 to 2. All you need to do is write (as you have already done) 1 and 2 in the eigenvector basis. Then evolve 1 in time t and project it into 2, to find the probability of finding 2.

Well...about details related to spin I might commit errors becaue I have no deep knowledge of relativistic quantum mechanics, which is where spin is accounted more precisely as far as I know. But in non-relativistic quantum mechanics (at least for spin 1/2, which is the case of the electron)...

Actually, two electrons do not occupy the exact same state, the difference being the spin. What happens is that the "states" are spin-degenerated, that is, there are states with same quantum numbers, and differ only in spin. Think about the atomic levels for example: neglecting spin interaction...

Hello. What is troubling me is I can't stabilish a connection. and it seems to be it should exist, between the polarization of a material by displacement of the electron cloud and energy level transition in a molecule or solid. When an electric field is applied to a material, the "electronic...

Thanks. Already knew that, just expressed myself in a wrong way. I will let the original post the way it was, since your reply is right below it.

Hello. I have been in contact with some papers that use DFT softwares for calculating properties of solids, nanoparticles, etc and a lot of them comes with colorfull plots of density of states. I know the density of states gives the number of electrons in the range of energy, but what I don't...

Hello. I would like to hear of somebody with experience in the area of materials science (theoretical/computational or experimental) the answer to the following question: What kind of Physics knowledge one must have to work in this area. I mean, how much of the basic Physics stuff you must know...

Thanks for your answer. Concerning the possible areas I wonder if some useful materials research can be done qith DFT(of course I intend to learn another methods used in quantum physics/chemistry, but my main question is regarding this specific type of DFT softwares), is about electronic...

Hello. I started studying DFT and using it for a bit of work I needed to do in College. I found it a bit interesting, because of the possibility of getting in touch with more "applied" science. However, after a time reading papers related to it I got a little disappointed. It seems to me that...

Thanks for the reply. Didn't have time to check with the IT department and as sometimes they recquire you to leave your computer there for some time with them and I am currently in need of using it I am postponing it and trying some suggestions to solve this, and using other connections when I...

Some suggestions ot solve my problem include set the network to " Obtain IP/DNS address automatically ". I've seen that in other operational systems this setting is pretty easy to find, but I can't find a way to do it on kubuntu. Can someone tell me how its done. Thanks.

Hello I use kubuntu on my computer. Until recently I could normally connect the internet in the university, but now it is impossible. It connects to the network but it doenst redirect to the login screen, hence turning impossible to use the internet. Can someone solve this for me? Thanks.

I found in this forum an old thread regarding this topic, but as it didn't have (in my opinion) a satisfactory answer, I decided to open a new one. Usually when one begins to study Electromagnetism, Coulomb's law in introduced as an experimental result valid for static point charges. From...