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Re: [Imgcif-l] ... also

Hi James, Herbert,

What you say I think is correct but not complete. For instance, if the
fundamental beam size is ~ 120 x 80 microns (as it is on our phase 1
stations here) then slits at 200 x 200 won't mean anything, but slits at
80 x 80 will... Describing all of this information would help to give
hints about the expected beam profile - a 40 x 40 "beam" above will
likely be pretty uniform.  

Based on this I would propose:

_diffrn_radiation.beam_size_x
_diffrn_radiation.beam_size_y

To refer to the "fundamental" beam - that which you would receive with
no additional collimation - as a FWHM I assume. Then:

_diffrn_radiation.collimation_x
_diffrn_radiation.collimation_y

To refer to the recorded spacing of the slits. I could see in terms of
actually recording this information that this would be doable - the
former would be a property of the beamline, the latter a data collection
choice.

Best wishes,

Graeme

-----Original Message-----
From: imgcif-l-bounces@iucr.org [mailto:imgcif-l-bounces@iucr.org] On
Behalf Of James Hester
Sent: 16 February 2010 23:14
To: The Crystallographic Binary File and its imgCIF application to image
data
Subject: Re: [Imgcif-l] ... also

I agree with Herbert's suggestion, although I would name the tags

_diffrn_radiation.beam_size_x
_diffrn_radiation.beam_size_y

simply because that makes more immediate sense to me. 'Spread' reminds
me of 'wavelength spread', 'angular spread', 'vegemite' etc. But that
might just be me.

I would advocate against the use of a slit width unless enough
information is provided to interpret its meaning i.e. location of the
slit relative to source/monochromator/sample/other slits.

NB The powder CIF dictionary defines beam size tags for the size of the
beam at the sample (DDL1, however).

James.

On Wed, Feb 17, 2010 at 12:05 AM, Herbert J. Bernstein <
yaya@bernstein-plus-sons.com> wrote:

> Another nice question.  We have the angular crossfire in
>
> _diffrn_radiation.div_x_source
> _diffrn_radiation.div_y_source
> _diffrn_radiation.div_x_y_source
>
> Should this new tag be viewed as a characteristic of the beam, say
>
> _diffrn_radiation.spread_x_source
> _diffrn_radiation.spread_y_source
> _diffrn_radiation.spread_x_y_source
>
> or, as Graeme suggests, the width of slits collimating the beam or as 
> ???
>
> Suggestions, please.
>
> =====================================================
>  Herbert J. Bernstein, Professor of Computer Science
>    Dowling College, Kramer Science Center, KSC 121
>         Idle Hour Blvd, Oakdale, NY, 11769
>
>                  +1-631-244-3035
>                  yaya@dowling.edu
> =====================================================
>
> On Tue, 16 Feb 2010, Graeme.Winter@Diamond.ac.uk wrote:
>
> > Hello again,
> >
> > Is there a way to specify the size of the beam - or at least, the 
> > gap between the slits? This obviously relates to the question
before.
> >
> > Looking in the dictionary from version 1.5.4 - 2007-07-28 I could 
> > not find these (this was the latest dictionary I could find in the 
> > cbflib
> > distribution)
> >
> > Thanks again,
> >
> > Graeme
> >
> > Graeme Winter
> > Software and MX Support Scientist
> > Diamond Light Source
> >
> > +44 1235 778091 (work)
> > +44 7786 662784 (work mobile)
> >
> >
> >
> >
> >
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