Recent content by antonni

Hi watch this for example. It comes up always. Start from 16:30 and pay special attention to 18:55. I WILL SAY AGAIN: We find the vector (S-S0)/lambda, this has units of 1/length and ONLY THEN WE EXPRESS IT as a vector in the reciprocal space. Then we WRITE THE CONDITION FOR CONSTRUCTIVE...

Well, this question was moved from the General Math forum here. Reason: "Physics question, mathematically they could be fractions". I keep insisting that NOT, this is a MATHEMATICS question, simple as that. If mathematicaly they could be fractions, the there is something very wrong with the...

Well, these are very important numbers (h,k,l), true. But we start without restrictions, only then we get the condition for constructive interference: h*p+k*q+l*r = integer (or more precisely h*p+k*q+l*r = integer*2*pi) knowing that p,q,r are integers. From here it is pure mathematics (THE...

Hi, to understand finally the Laue equation for diffraction I am missing something : h*p+k*q+l*r = integer. Given that p,q,r are integers how come h,k,l MUST BE INTEGERS as well? Say p=q=r=2, than h=k=l=1/2 works just fine. I understand that there is something about a common...

hohohoo

Hi there, no one?

Hello good people, please refer to this: (notice the mistake in 9.31: cos(psi) switches places with cos(phi)sin(psi) to the best of my understanding) Now, I am trying to derive 9.30 and for this, according to the book, we solve 9.32. The problem is I can not understand 9.32, the meaning of...

Thanks for the reply...yes, just one of those things everyone takes for granted and think its basic knowledge, but not straight forward at all ill try it again

don't know really how to reword it...but others can try

Hi all, first let me post this (from "Elementary Crystallography An Introduction to the Fundamental Geometrical Features of Crystals" by Buerger): https://www.physicsforums.com/attachments/1-png.82644/ Can someone please explain me the proof of Lemma 1? I just can not see it with the "mini...

Guess no SEM experts here :) Got tons of books- finally found one ("Introduction to texture analysis") that actually addresses the difference between kikuchi bands in SEM a.k.a EBSD (pseudo-kikuchi bands they are called, it turns out) and TEM (kikuchi bands)...but of course, surprise...

Good day, anyone can point out to me how kikuchi bands are formed? And I mean bands, not lines. I finally managed to understand (I think) kikuchi lines: bragg diffraction is decreased in the incident direction (defecit=darker line) and enhanced in the "bragg" direction (excess=brighter line)...

Perhaps (well..probably) I have not, will be grateful for clarification. "but as there is no path difference"- Hmm, if the angle of incidence equals the angle of reflection, which is a condition for Bragg's law...I guess so. Do not know if I'm allowed to "link" here...but here (from min. 11:30...

Hi guys, new here. We all know the famous "Bragg Law" and the attached schematic drawing that goes along with it of a couple of planes with a distance `d` between them. Then, a DP occurs cause of constructive interference and destructive interference which happens due to planes deep in the...