Recent content by Lemenks

Yes I know the intensity at I(r,z) and need to calculate it at I(r,0) - sorry if I made it unclear. I was just a little confused as to the proper way of making this calculation, the beam focusing as a cone shape seemed too approximate and also to contain really large errors so I was trying to...

I carried out a physics experiment and I wanted to analysis the problem with matlab. I have some code in MATLAB that "works" as in it gives ok result but the numbers used are quite nonsensical, I need help making the reworking the equation with real numbers. I am not sure if this is the correct...

A Gaussian beam has an intensity I(r,z), if the beam area at position Z is given by A(Z), then the beam gets focused by a lens of focal length f, what will the area of the beam be at the beam waist A(0) be? So I have been trying to figure this out for ages, I had to replicate an experiment in...

Thank you for your input, it was very helpful.

Homework Statement I was doing an experiment containing gas or vacuum tubes "type 884 tube". It contains argon gas but when reading about triodes and cathode ray tubes, they are generally referred to as vacuum tubes - the type 884 tube is a triode, so does that mean it is a gas filled triode...

Homework Statement I need to calculate interference peaks using the atomic form factor for several lattice types for a lab report. I was given the expected answers but told I should also be able to calculate them.Expected results for rocksalt (eg NaCl): h+k+l = 2n fh+k+l = 4(fa+fb) h+k+l =...

Ohh, I actually made a mistake, fj(K) is the actual atomic form factor, I solved the geometric form factor for a BCC lattice but I am struggling to add in the atomic form factor. ~ I guessed that I simply multiply each geometric form factor answer for a BCC lattice by each atomic form factor...

Homework Statement I am trying to calculate the atomic form factor for various crystals (NaCl, LiF, GaP, Si) in an x-ray diffraction experiment. There seems to be very little information on this topic anywhere.Homework Equations [/B] I understand how to derive the geometric form factor Sk =...

Emm, I think its a SC primitive cell with a two point basis, where Cs is at the point (0,0,0) and Cl is at the point (1/2,1/2,1/2).

Homework Statement A crystal composed of two fractions, one having the a cell parameters of 4.123A and the other of 3.997A are subjected to X-ray diffraction using both Cu k-alpha and a Mo k-alpha radiation. Derive the angular position of (2theta) for (100) and (110) planes. Explain the...

Homework Statement CsCl has a BCC unit cell containing 2 atoms, Cs in the origin of the cell and Cl at the centre of the cell. Describe the CsCl unit cell in terms of its primitive cell+basis. Homework Equations R = n1a1 + n2a2 + n3a3 ~ R is the vector which relates one point of the lattice...

Hey thanks for the reply, it is very concise and logical, I actually tried that but assumed I must have made a mistake as the value I was getting for the error seemed to large ~80%. The final equation I have is: dD = A (dx cosx)/(sinx)^2 This equation seems to give a value for error of about...

Homework Statement I am writing a lab report for an X-ray diffraction. I have been attempting to come up with an equation for the error using formulas some people from college gave me and also some I found on wikipedia but I am quite sure I am doing it wrong. The only variable is the angle...

Homework Statement I am writing a lab report for an X-ray diffraction. I have been attempting to come up with an equation for the error using formulas some people from college gave me and also some I found on wikipedia but I am quite sure I am doing it wrong. The only variable is the angle...