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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
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