From: Gresham Weatherly <gresham@unc.edu>
  To  : rasmb@alpha.bbri.org
  Date: Mon, 06 Dec 1999 14:09:43 -0500

XLA monochromator

I am trying to collect data at two different wavelengths during an
equilibrium sedimentation experiment. The monochromator does not always
collect the data at the correct wavelength, sometimes the header file shows
that it has collected + 1 nm from the desired wavelength.  This is okay
because I can discard these files that have been collected at the wrong
wavelength.
However, sometimes subsequent scans are offset even though the wavelength
in the header file is the same.  The attached file shows three scans that
have supposedly been collected at one wavelength, but appear to be
collected at different wavelengths. The data collected at the second
wavelength overlay, so I believe the system is at equilibrium.  
My question is when the monochromator collects five scans and averages them
does it collect all five scans at the same wavelength, and is there
anything I can do to make the XLA collect data at the right wavelengths?

Thank you for any help you can give me,

Gresham Weatherly
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Department of Chemistry; CB# 3290 
University of North Carolina
Chapel Hill, NC 27599-3290
Tel: Lab (919)962-1297, Home (919)933-7837
Fax: (919)966-3675