Atomic Density of a Given Plane

[vick5821]

Anyway, how do I find the atomic density of a given plane ? let say (110) ? The formula is atoms/volume ?

Thank you

 

[(*steve*)]

You measure the area of a 1 atom thick (or one molecule thick) layer of the substance. From the mass you can determine the number of moles and hence the number of molecules. From this and the area you can determine the area of the molecule on the surface of the film.

Is that what you're asking?

 

[vick5821]

I am confuse why atomic density the unit is atoms per cubic meter square ?

 

[Harald Kapp]

I am confuse why atomic density the unit is atoms per cubic meter square ?

No it isn't. It is atoms per cubic meter (or cubic cm or...). There is no additional squaring involved.

See http://wiki.answers.com/Q/What_is_atomic_density

Harald

 

[vick5821]

See this question :
Q :

A :

Is that mistake in the solution ?

 

[Harald Kapp]

No, the text is about the number of atoms in a plane. A plane is per definition just 1 atom layer thick, so the density can be given as atoms/cm².

 

[vick5821]

you mean in 2D ?

 

[Harald Kapp]

Yes, 2D

 

[vick5821]

In normal case they assume to be in 3D ?

 

[Harald Kapp]

That would be the volumetric atomic density. But the task at hand asked for the atomic density of a specific plane.

 

[vick5821]

That would be the volumetric atomic density. But the task at hand asked for the atomic density of a specific plane.

Okay. Thank you

How bout this ? https://www.electronicspoint.com/hall-effect-t248784.html

 

[Harald Kapp]

Sorry, I have read that post but I am in no position to answer it.

Harald