Dear Natale,
I think you are seeing two effects instead of one.
First of all, you will indeed see Co fluorescence. Cu K-Alpha1 is able to excite Co fluorescence very efficiently, as mentioned already by Jens.
The choice of optics and radiation with this type of samples can be tricky when you work without a diffracted beam monochromator. I looked into the fluorescence issue last year, I can send you some papers if you are interested.
The strength of the fluorescence signal, however, should be constant as you irradiate a constant volume of material.
The fact that you observe an increasing background towards high angle suggests that your sample absorbs most of the X-rays. If the signal mainly comes from the first micrometers of material in the capillary it explains why the background is increasing towards high angles (your detector starts to see more of the side of the capillary that is irradiated by the incident beam). What is the thickness of the capillary you are using? What is the compound you are investigating?
With best regards,
Martijn
Dr. Martijn J. Fransen
Product Manager XRD
PANalytical
Lelyweg 1
7602 EA Almelo, The Netherlands
Phone ++31 546 534 345
Fax ++ 31 546 534 598
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"Natale Perchiazzi" <[EMAIL PROTECTED]> 11/06/2004 03:39 PM
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Dear All,
performing a scan of a Co compound, in capillary setup, with CuKa1 primary
monochromated radiation, PSD detector, I get a bkgd decreasing as usual
from 10 to 50�, but then constantly increasing from 50� up to my upper
scan limit (100�). I have no ready aexplanation for this, and your
suggestions will be welcome.
Best regards Natale Perchiazzi
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