Recent content by hjelmgart

I was brain farting, lol. You are only concerned about the cross product and not the contribution from the electric field, ok. So it's not really the Lorenz force, that is the problem, it is the magnetic force. I made it through my electromagnetism course without the relativistic understandings...

I no longer understand your problem. You are here concerned with the lorenz force of a particle, but it seems to me like you are mixing it up with electromagnetic waves (light). The magnetic force does not have to be perpendicular to the direction of a particle moving through a magnetic field...

The way I understand the cross product is simple. You have vectors as you work in 3d space. The direction of the magnetic field may influence the direction of the particle, and thus you need the cross product to find the direction it moves after being affected by the magnetic field with respect...

a) So at this point in time, you now need to find the y-coordinate of the electron. You know the acceleration in the y-direction. Can't you find an equations, which you could then use? Perhaps the very same equation, you just used to find the time, just with different parameters?

Yeah I am aware of all this. My point was quite simply to see, if somebody had seen, or had an idea of what this interference pattern I saw in my model could be. So I just wanted people to assume, the model was working as it should, and then comment on the graph. Although it's probably hard...

1. Ah that made perfectly sense. 2. yeah I know that, but you know when a question surfaces, while writing another, you just write that down as well. May take it to another thread perhaps. Thanks anyway!

Yeah, they are only from the model. We did not actually show this phenomenom I am wondering about experimentially, because well, we didn't have time. :-) But we used an ellipsometer for the experiments, it had an angle adjustment, and you have this type of "alignment"-camera-thing, which you...

I see I have used several instruments in the lab to do it, but I'm fairly certain they measure absolute pressure. Or perhaps they don't but the computer simply convert it to absolute pressure, although here we typically want a lower pressure to stabilise a gas, plasma or whatever (at least in...

Uhm, I'm not sure I get what you mean. We just put it to whatever value in the program (Matlab).

Ah yeah it was quite clear, what the goal was :-) 1) It was s-polarised light. 2) Hmm, as the structure was periodic we only modeled a single 'period' in the grating. We used Green's functions to solve the electric field inside the scatterer, and we made it periodic with Bloch conditions...

Okay I see, then I guess if I had ever used such instrument, I would have known it, for instance if I had car. :)

Some of us are easier to be fooled than others :P I am still confused how to see, that it is not the absolute pressure, that was given in the information though.

Well I don't think it is simple to do, but I modolled the reflectance from a specific grating as the one shown in the beginning. No we only made pyramidal structure as the one shown. The structure was locked by an etching relationship between the (100) and (111) crystallographic planes...

Try using 14.5 psi instead as that corresponds to 1 bar, it's hard to know, which they have used to calculate it, but it's worth a shot. If that also doesn't work, perhaps you need to calculate the atmospheric pressure depending on the temperature as well :-) (that was a bad joke, I doubt...

Hmm, for starters you wrote Δx = 0.75, but it's 0.74 (not sure if you noticed this). Also how does the blocks move depending on each other? Is one moving in the horizontal axis and the other on the vertical axis? Or are they both moving in the vertical axis (as I understood it). Also perhaps I...