Re: [Phys-l] Gas Desorption

[jbellina <jbellina@saintmarys.edu>]

Depending on beam energy, electrons and ions can modify the surface  
somewhat...don't know if that would be a concern.  Sulphuric acid  
tends to leave, as I recall, some adsorbed sulfur which could be a  
problem.

so, Bernard, are you or were you a surface scientist...what sort of  
work did you do?

cheers,

joe

Joseph J. Bellina, Jr. Ph.D.
Professor of Physics
Saint Mary's College
Notre Dame, IN 46556

On Nov 25, 2006, at 6:35 PM, Bernard Cleyet wrote:

> One may also use electron and ion bombardment and plasma cleaning.  In
> the case of plasma cleaning it's important to use aluminium  
> electrode(s)
> to prevent sputtering.
>
> bc, who once cleaned glass using an ancient method (chromic /  
> sulphuric
> acid).  Also, substrates w/ electron bombardment and plasma, and just
> heat w/ a Varian oilless UHV system.
>
>
> http://www.faqs.org/faqs/sci/chem-faq/part4/section-1.html
>
>
> Brian Whatcott wrote:
>
> > At 10:23 PM 11/24/2006, Suraj, you wrote:
> >
> >
> >
> > > Suyraj Parkash
> > > 38, Azad Nagar, Jagadhri Road,
> > > AMBALA CANTT 133006 (India)
> > > .
> > > NOVEMBER 25, 2006
> > > .
> > > Dear Sirs :
> > > ..
> > >             I wish to know the procedure to degas and clean
> > > vacuum discharge tubes of gaseous impurities specically in
> > > spectrum analysis gas tubes.
> > >
> > >             SurajParkash
> >
> >
> > A vacuum bake-out is a good place to start. 150 to 300 degC
> > Take a look at the easily accessible literature.
> > As usual, Google is your friend
> >      <http://www.google.com>
> >
> > Take a look at this PDF file for example for an example of
> > extended gas desorption efforts.
> > (you need an Adobe reader, which is freely accessible.)
> >
> > <http://pubs.acs.org/cgi-bin/abstract.cgi/ancham/1979/51/i08/f-pdf/ 
> > f_ac50044a029.pdf?sessid=6006l3>
> >
> >
> >
> >
> > Brian Whatcott    Altus OK    Eureka!
> >
> >
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