# Questions tagged [braggs-law]

Condition for the angles for coherent and incoherent scattering from a crystal lattice, summarizing the diffractive interference pattern dictated by the geometry of the lattice. Normally for Rayleigh scattering (elastic scattering) of X-rays off atom lattices; but also for scattered neutron waves from nuclei or by a coherent spin interaction with an unpaired electron.

72 questions
Filter by
Sorted by
Tagged with
67 views

### What is the smallest value of the incident angle in Bragg's law?

The title of my question basically is what I want to know. In Bragg's law, $nλ = 2 d \sin{\theta}$, if we want to find, let's say, $d$, and know only $\lambda$ and $n$, but not $\theta$, what could be ...
1 vote
67 views

### What is the catch behind the simple expression and explanation of Bragg's Law?

Consider how the topic of scattering by periodic crystal structures is covered in most books: Start by treating the crystal structure as a periodic potential and use Fermi's Golden Rule to show that ...
22 views

### Coherent and incoherent electron diffraction

I am learning about electron diffraction in a transmission electron microscope and was wondering about following topic: A single crystalline material will exhibit a diffraction pattern with discrete ...
99 views

### Why is Bragg's Law always presented as $n\lambda=2d\sin \theta$?

In the vast majority of texts and handbooks on Bragg diffraction, Bragg's formula is presented as: $$n\lambda=2d\sin \theta\tag{1}$$ where $\theta$ is the incident angle. But constructive interference ...
61 views

### Assigning Miller indices to Bragg diffraction angles

I am a bit confused with the procedure to index diffraction peaks obtained in X-ray crystallography using the powder method. The incident wavelength $\lambda$ is known and the lattice constant $a$ is ...
1 vote
20 views

### Can raman be used to know the number of layers other than graphene?

I came across some paper where the number of layers of Graphene have been investigated by Raman spectroscopy. I found simulation websites https://instanano.com/characterization/calculator/raman/...
41 views

### Laser diffraction by synthetic Opal: how to determine "$d$"?

I'm doing some measurements with laser diffraction on a cut cube of synthetic opal. Here's a stock photo of it: The shimmering colours are due to diffraction of visible light on intermolecular planes ...
41 views

### Minimum distance for two parallel beam to interfere effectively

Following is an illustration of two parallel monochromatic beams interfering in Bragg's law experiment. For these two rays to interfere, what is the minimum distance OF required? I understand that the ...