Recent content by poul

Hey. I am writing my master thesis, and I really need to find the temperature dependent heat capacity and expansion coffient for Cobalt. I have tried searching the internet, whitout luck. Please, can anybody help me. It is really important!

Thanks alot. I really appreciate yout help. Do you have the name of the computerized database?

OKay. I went to the libraby, and the gave the password and link to some website. Now I have found everything ecept the heat capacity at constant volume... do somebody know where to find this constant?

Okay, I will try to find out. I have never been at the chemistry department. So there is no easy way to find these values? I can see that some other guys, for different liquids, have used http://www.hbcpnetbase.com/. Unfortunately it is password protected...

You mean, going to the university library? Can you just do that, I mean they are not experts on chemistry?

Hey I am a physics student, and not so familiar with chemistry. I have a huge problem, because I have to find the following 3 values for liquid isopropanol: 1. The specific heat capacity at constant volume 2. The specific heat capacity at constant pressure 3. Volumetric Isobaric...

okay so for a normal gas discharge lamp, we have free electrons you say. Are these made, by heating a filament or similar and then accelerated?

I think i have looked at like 20-30 web pages, and i can't find a simple step-by-step explanation of the operational principle. I know, that when a rare gas like Helium, relaxes from an excited state two characteristic emission lines occur. But how do you excite the gas in the first place...

Okay. As i understand it they are both semiconductor detectors, where the number of generated electron hole pairs says something about the signal. I think i got some of it. In a CMOS the charge-to-voltage conversion takes place in each pixel. In a CCD each pixel’s charge packet is send to a...

Hey I was wondering, is a CDD camera(e.g. FreLon detector) the same as an ordinary semiconductor detector (e.g. Pilatus detector). I have searched a little on the CDD camera, and for me it seems like the same thing. Wave Energy -> electron hole pairs -> signal. Or have it something to do...

Hey I have a x-ray setup as in the figure, where alpha is the angles between the incoming x-ray beam and the sample. The x-ray are scattered, and measured by a 2D detector in the two outgoing angles. From this i will get a "slice" of the 3D recipricol map. If a want a 3D map, i think i will get...

Okay, I have to prove: ∫(-infinity:infinity) cos(pi*v/(2L))*e-((L-L_{av})^2/(2*sigma^2)) dL proportional to cos(pi*v/(2L_{av}))*e-(t/tau)^2 sigma << L_{av} - both positive

Homework Statement I have to prove: ∫(-infinity:infinity) cos(pi*v/2L)*e^-((L-L_av)^2/sqrt(2pi)*sigma^2) dL proportional to cos(pi*v/2L_av)*e^-(t/tau)^2 tau is some constant, and sigma << L_av. The Attempt at a Solution i can change the integral to 0:infinity, since sigma <<...

Hey If I have a InAs Wurtzite structure, and now the a and c parameter from tables. How can i calculate the distance between (1 0 3/2)_sur layers? (in surface coordinates) I need it to find the angle of reflection, for a (1 0 3/2) WZ InAs peak. Is it just so simple? (1 0 3/2)_sur =...