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Re: [Imgcif-l] ... also
- To: The Crystallographic Binary File and its imgCIF application to image data <imgcif-l@iucr.org>
- Subject: Re: [Imgcif-l] ... also
- From: harry powell <harry@mrc-lmb.cam.ac.uk>
- Date: Wed, 17 Feb 2010 09:06:51 +0000
- In-Reply-To: <279aad2a1002161513h77b926b1y239ee4192442e55b@mail.gmail.com>
- References: <4854F2500EA8C4478A508D2D92973E5206D6B2EA@EXCHANGE25.fed.cclrc.ac.uk><alpine.BSF.2.00.1002160753380.66907@epsilon.pair.com><279aad2a1002161513h77b926b1y239ee4192442e55b@mail.gmail.com>
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) >>> >>> >>> >>> >>> >>> -- >>> >>> This e-mail and any attachments may contain confidential, >>> copyright and >> or privileged material, and are for the use of the intended >> addressee only. >> If you are not the intended addressee or an authorised recipient >> of the >> addressee please notify us of receipt by returning the e-mail and >> do not >> use, copy, retain, distribute or disclose the information in or >> attached to >> the e-mail. >>> >>> Any opinions expressed within this e-mail are those of the >>> individual and >> not necessarily of Diamond Light Source Ltd. >>> >>> Diamond Light Source Ltd. cannot guarantee that this e-mail or any >> attachments are free from viruses and we cannot accept liability >> for any >> damage which you may sustain as a result of software viruses which >> may be >> transmitted in or with the message. >>> >>> Diamond Light Source Limited (company no. 4375679). Registered in >>> England >> and Wales with its registered office at Diamond House, Harwell >> Science and >> Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> imgcif-l mailing list >>> imgcif-l@iucr.org >>> http://scripts.iucr.org/mailman/listinfo/imgcif-l >>> >> _______________________________________________ >> imgcif-l mailing list >> imgcif-l@iucr.org >> http://scripts.iucr.org/mailman/listinfo/imgcif-l >> > > > > -- > T +61 (02) 9717 9907 > F +61 (02) 9717 3145 > M +61 (04) 0249 4148 > _______________________________________________ > imgcif-l mailing list > imgcif-l@iucr.org > http://scripts.iucr.org/mailman/listinfo/imgcif-l Harry -- Dr Harry Powell, MRC Laboratory of Molecular Biology, MRC Centre, Hills Road, Cambridge, CB2 0QH _______________________________________________ imgcif-l mailing list imgcif-l@iucr.org http://scripts.iucr.org/mailman/listinfo/imgcif-l
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- [Imgcif-l] ... also (Graeme.Winter)
- Re: [Imgcif-l] ... also (Herbert J. Bernstein)
- Re: [Imgcif-l] ... also (James Hester)
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