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Re: [Imgcif-l] ... also

Hi

Yes, it makes sense to have the definition of the size at the edge of  
the slits nearest the crystal and the divergence (or cross-fire,  
whatever you want to call it), since it should be simple arithmetic  
(for a simple beam) to work out from that the size of the beam at the  
crystal and the detector.

On 16 Feb 2010, at 23:13, James Hester wrote:

> 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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Harry
--
Dr Harry Powell, MRC Laboratory of Molecular Biology, MRC Centre, Hills
Road, Cambridge, CB2 0QH




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