The image above represents inter-atomic spacing.

To compute for inter-atomic spacing, three essential parameters are needed and these parameters are **Order of Reflection (n), Wavelength (λ) **and **Angle of Diffraction (θ).**

The formula for calculating inter-atomic spacing:

d = ^{nλ}/_{2sinθ}

Where:

d = Inter-atomic Spacing

λ = Wavelength

n = Order of Reflection

θ = Angle of Diffraction

Let’s solve an example;

Find the inter-atomic spacing when the wavelength is 12, order of reflection is 4 and the angle of diffraction is 6.

This implies that;

λ = Wavelength = 12

n = Order of Reflection = 4

θ = Angle of Diffraction = 6

d = ^{nλ}/_{2sinθ}

d = ^{(12)(4)}/_{2sin(6°)}

d = ^{48}/_{2(0.104)}

d = ^{48}/_{0.209}

d = 229.6

Therefore, the **inter-atomic spacing **is **229.6 m.**