Newsgroup sci.techniques.mass-spec 1095

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Subject: srm on TSQ 700
From: "Rick Flurer"
Date: 17 Nov 1996 20:27:18 -0500

Can anyone out there offer an explanation for why the TSQ 700 DS seems to
lock-up when peforming an SRM LC/MS run wherein several (> 4) 
precursor/product transitions are monitored simultaneously??  The SRM
parameters are set up prior to the run using the GUIDE view.  We are using
ICL 7.4 and ICIS 7.0. 
thanks,
rick flurer

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Subject: Re: srm on TSQ 700
From: David Higton
Date: 18 Nov 1996 08:15:16 -0500

"Rick Flurer"  wrote:
}Can anyone out there offer an explanation for why the TSQ 700 DS seems to
}lock-up when peforming an SRM LC/MS run wherein several (> 4)
}precursor/product transitions are monitored simultaneously??  The SRM
}parameters are set up prior to the run using the GUIDE view.  We are
}using ICL 7.4 and ICIS 7.0. 
}thanks,
}rick flurer
}
 Does the instrument lock up straight away or after a number
of samples? I had a problem with ICL procedures not stopping after
analysis causing lock up. 
However, it may be the use of GUIDE that is the cause of the problem. Try
writing an ICL and see if this removes the problem, as well as giving the
opportunity to change collision energy with each experiment
Dave Higton

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Subject: Spot welding tungsten
From: J K Brandau
Date: 18 Nov 1996 12:54:09 -0500

Orlando Cabarcos wrote:

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Subject: Re: Tungsten spot weld question
From: rehaufler@comstockinc.com (R. E. Haufler)
Date: 18 Nov 1996 13:59:00 -0500

On 15 Nov 1996 08:55:09 -0500, cabarcos@aries.scs.uiuc.edu (Orlando M.
Cabarcos) wrote:
Tungsten spot welds very nicely to:
Tungsten
Tantalum
Molybdenum
Stainless Steel
Nickel
I have found it much better to use prefabricated filament assemblies.
Making my own is something that I have never mastered.  You can buy
prefab filament assemblies for about $10 to $400 each.  
R. E. Haufler
rehaufler@comstockinc.com
http://www.comstockinc.com
}Does anyone know what material tungsten spot welds to the best?  I am
}currently modifying an ionizer and need to know what the filament posts
}need to be made of to make a secure weld.
}
}Thanks in advance,
}
}Orlando Cabarcos
}
}University of Illinois
}cabarcos@aries.scs.uiuc.edu
}-- 
}
}

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Subject: Re: GC/, LC/MS techniques & instruments question
From: Fred.Mellon@bbsrc.ac.uk (Fred Mellon)
Date: 18 Nov 1996 12:54:33 -0500

In article <56adh7$q3p@acmey.gatech.edu>, 
 says:
}
}
}Is/are there book/s or articles describing GC/MS & LC/MS 
techniques, 
}applications and/or currently available instrumentation, how to 
}configure for particular apps, etc?
}
}
Suggest you try Mass Spectrometry for Chemists and Biochemists 
(second edition), by R. A. W. Johnstone and M. E. Rose, published 
1996 (ISBN 0 521 41466 0 hardback; 0 521 42497 6 paperback). 
Cambridge University Press, 1996.
You can also obtain, free of charge, useful monographs on LC/MS, 
GC/MS, MS/MS etc. from Micromass (formerly VG Instruments), 
Tudor Road, Altrincham, WA14 5RZ, UK.
Fred Mellon
Institute of Food Research
Norwich Research Park
Colney
Norwich NR4 7UA
UK

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Byron Palmer

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