Science > Physics > Laue Method: X-ray go through self-coherent or not?
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Science > Physics |
| User: |
"" |
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08 Mar 2005 03:11:07 AM |
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Laue Method: X-ray go through self-coherent or not? |
Does anyone knows the order of intensity of X-ray in a Laue method
experiement?
From this information I can deteremind is the diffraction pattern a product
of self-coherent or not.
Thanks
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| User: "Uncle Al" |
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| Title: Re: Laue Method: X-ray go through self-coherent or not? |
08 Mar 2005 10:53:06 AM |
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wrote:
Does anyone knows the order of intensity of X-ray in a Laue method
experiement?
From this information I can deteremind is the diffraction pattern a product
of self-coherent or not.
Say what? The beam isn't even monochromatic - though they do filter
and try. Diffraction occurs at the atomic planes, as with any
multiple slit experiment.
A double slit experiment works fine with a flashlight. It works
better with an LED source (reasonably monochromatic) and better still
with an expanded laser pointer.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "" |
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| Title: Re: Laue Method: X-ray go through self-coherent or not? |
08 Mar 2005 03:48:17 PM |
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In article <422DD872.2FBE4777@hate.spam.net>, Uncle Al <UncleAl0@hate.spam.net> writes:
NewsUser@shaw.ca wrote:
Does anyone knows the order of intensity of X-ray in a Laue method
experiement?
From this information I can deteremind is the diffraction pattern a product
of self-coherent or not.
Say what? The beam isn't even monochromatic - though they do filter
and try.
Oh, you can get it reasonably monochromatic using a Bragg reflection.
Getting delta_E/E around 10^(-4) is straightforward, for 10^(-6)
you've to work a bit. Better than this, takes lots of effort.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "" |
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| Title: Re: Laue Method: X-ray go through self-coherent or not? |
08 Mar 2005 03:30:26 AM |
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In article <L_dXd.605534$6l.224085@pd7tw2no>, <NewsUser@shaw.ca> writes:
Does anyone knows the order of intensity of X-ray in a Laue method
experiement?
From this information I can deteremind is the diffraction pattern a product
of self-coherent or not.
Eh? What do you mean by "order of intensity"?
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "" |
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| Title: Re: Laue Method: X-ray go through self-coherent or not? |
08 Mar 2005 03:37:54 AM |
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"Order of magnitude of the intensity."
Actually, for simplicity, what is the intensity used in a Laue method
experiment.
Or if someone knows is the X-Ray self-coherent or not.
<mmeron@cars3.uchicago.edu> wrote in message
news:SgeXd.18$45.4939@news.uchicago.edu...
In article <L_dXd.605534$6l.224085@pd7tw2no>, <NewsUser@shaw.ca> writes:
Does anyone knows the order of intensity of X-ray in a Laue method
experiement?
From this information I can deteremind is the diffraction pattern a
product
of self-coherent or not.
Eh? What do you mean by "order of intensity"?
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "Gregory L. Hansen" |
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| Title: Re: Laue Method: X-ray go through self-coherent or not? |
08 Mar 2005 09:33:01 AM |
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In article <SneXd.603915$Xk.205664@pd7tw3no>, <NewsUser@shaw.ca> wrote:
"Order of magnitude of the intensity."
Actually, for simplicity, what is the intensity used in a Laue method
experiment.
Usually as high as you can get. People use tabletop x-ray sources, and
they use synchrotrons. Those intensities are separated by orders of
magnitude.
The reflected intensities depends on the incident beam intensity, and also
on the monochromicity and collimation of the beam, and on the thickness,
quality, and angle of the crystal. If you have a well colllimated, highly
monochromatic beam incident at a Bragg angle on a perfect crystal, you'll
reflect essentially all the light. Less will be reflected of a
polychromatic beam because more components will be farther away from the
Bragg condition. Less will be reflected from a poorly collimated beam
because less of the incident radiation will hit the right angle. A
mosaic or polycrystal will reflect less of a particular wavelength for a
particular Bragg angle, but more total radiation from a polychromatic
beam, because the crystallites will have a great variety of orientations
and there will be something that can reflect anything.
--
"Suppose you were an idiot... And suppose you were a member of
Congress... But I repeat myself." - Mark Twain
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| User: "" |
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| Title: Re: Laue Method: X-ray go through self-coherent or not? |
08 Mar 2005 04:33:01 AM |
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In article <SneXd.603915$Xk.205664@pd7tw3no>, <NewsUser@shaw.ca> writes:
"Order of magnitude of the intensity."
Meaning? You may be talking about flux, brightness, brilliance.
Which one?
Actually, for simplicity, what is the intensity used in a Laue method
experiment.
Or if someone knows is the X-Ray self-coherent or not.
If you mean, whether the x-ray beam is coherent, the answer is, in
general no. Partially coherent.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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