That hits the nail on the head. When I encounter these scans, I will add
this term to the metadata:
[Term]
id: MS:1000497
name: zoom scan
def: "Special scan mode, where data with improved resoltuion is acquired. This
is typically achieved by scanning a more narrow m/z window or scanning with a
lower scan rate." [PSI:MS]
synonym: "enhanced resolution scan" EXACT []
is_a: MS:1000499 ! spectrum attribute
I realize that "Zoom" scan in Thermo is something else, but the
definition still appears to be accurate ("or scanning with a lower scan
rate").
Thanks!
-Matt
Science Gurl wrote:
> Yes, you'll see something like: */ITMS + p NSI E full scan
> (400-1800)/* in the scan filter/header information on the file.
>
> Does this help?
>
> -jane
>
>
> On Fri, Sep 18, 2009 at 4:30 PM, Matthew Chambers
> <[email protected]
> <mailto:[email protected]>> wrote:
>
>
> Hi Jane,
>
> Thanks for answering so quickly. This filter line was found on an
> LTQ XL
> RAW file. Does the "enhanced scan speed" you mention result in the 'E'
> in the filter line?
>
> Thanks,
> -Matt
>
>
> Science Gurl wrote:
> > If you mean "enhanced" scan speed and you're using an ion trap
> (linear
> > or LCQ), I'd highly recommend choosing it. The scan speed is
> slightly
> > slower than the normal speed and allows for better mass accuracy
> and a
> > better chance at seeing the charge envelop (thus better able to
> > determine charge state). I have an LXQ and find that when I use
> > "enhanced" I get mass accuracy approaching +/- 0.2 - 0.5 amu vs unit
> > resolution for regular. Of course this only applies to profile
> data,
> > I don't know if it's even an option in centroid collection mode. I
> > also use it for my ms/ms.
> >
> > -jane
> >
> > On Fri, Sep 18, 2009 at 4:00 PM, Matthew Chambers
> > <[email protected]
> <mailto:[email protected]>
> > <mailto:[email protected]
> <mailto:[email protected]>>> wrote:
> >
> >
> > Does anybody know what this means? How does it affect the
> data and/or
> > metadata?
> >
> > Thanks,
> > Matt
>
>
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