# What is sin$_{2}$$\theta$min in regards to XRD

1. Jun 4, 2013

### Qrux

Hi i have 2$\theta$ and have found sin$_{2}$$\theta$ from that but what does sin$_{2}$$\theta$min refer to?

i attached the graph i'm trying to fill out, the information i have is; the peak list with 2$\theta$ the height of the peak in counts, FWHM Left, d-spacing and the relative intensities of the peaks

anyone know what is meant by sin$_{2}$$\theta$min

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2. Jun 5, 2013

### HallsofIvy

First, you are writing it wrong. It is NOT "$sin_2\theta_{min}$", it is $(sin^2(\theta))_{min}$. The important thing is that the "min" is not on the $\theta$, it is on the entire function.

That is, it means the minimum value of $sin^2(\theta)$ over all possible values of $\theta$.

Last edited by a moderator: Jun 5, 2013
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