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From: Gilles Vautour <vautoug@unb.ca>
Date: Fri, 23 Jul 1999 16:19:14 -0300
Subject: Resolution
Organization: *

I am new to the mass spec world, I would like some suggestions as how we
practically set the resolution on the mass spec(we have a kratos MS50 with
the MASS SPEC software). I was planning to used two chemicals of closely
related mass, that I could try to separated. I am looking for two
chemicals, that when separated from each others would indicated to me that
the machine have a resolution of let say 5000 (m/delta m) or even 10000.
Does sombody have any suggestions regarding about which chemicals to used?
Is this a good way to go to set the resolution or is their a better way?

Gilles
vautoug@unb.ca

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From: david.bostwick@chemistry.gatech.edu (David Bostwick)
Date: Fri, 23 Jul 99 20:55:26 GMT
Subject: Re: Resolution
Organization: Georgia Institute of Technology, Atlanta GA, USA


On our 70SE, we use the peak matcher to look at the same peak, using the
offset control thumbwheels to adjust their relative horizontal positions
until there is a 10% valley.  The inverse of the thumbwheel reading is the
resolution.

One of the old standbys is the CO/N2 doublet (R=2500), but I don't recall
the others.

The DS90 software would tell you the resolution from the CRT display, but
I think it was FWHM.  Does anyone do something similar now?


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From: cody@jeol.com (Chip Cody)
Subject: Re: Resolution
Date: Mon, 26 Jul 1999 16:56:51 GMT
Organization: JEOL USA, Inc.

There is a list of common substances that are useful for checking
resolution on our web site, at http://www.jeol.com/ms/doublets.html
The 13C isotope of benzene and the molecular ion of pyridine
will be useful for checking a resolution of 10,000.  The exact
masses are listed on the web page. 

Good luck!

	Chip Cody


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