What is Pendellosung

[kaise_sose]

Hi All,
Doing an experiment at uni on TEM,
I need to know what Pendellosung is.
I suspect either it is some sort of crystal defect or
it is related to Laue condition and Ewald sphere, but these are only guesses.
I really don't know.

Please help
Thanks

[arildno]

Can't tell you what it means physically, but the word "Pendellösung" is German and means "pendulum solution"
Does that help?

[kaise_sose]

well if that is the case then I suppose that my first thought that it was related to the Ewald sphere is correct.???

Is it all related to the rings of higher intensity diffraction from higher order Laue zones, which you observe on TEM when looking at diffraction pattern.

From your post I was not sure wheather you knew the answer (and were nudging me in the correct direction) or you were yourself guessing.

[arildno]

I don't know a thing about the physics here, ONLY the meaning of the German word.
I only hoped that by clarifying the meaning of the WORD, you would know the meaning of the PHYSICS

[kaise_sose]

That's cool
still stuck.
Damn physics assignments

[Gokul43201]

I recall something about Pendellosung fringes when I was doing a course in X-ray diffraction. I think you can use spherical waves to determine the structure factor in a wedge shaped single crystal.

Perhaps the same idea works for TEM too. So I too would guess that it is related to Laue diffraction.