[Nexus] detector angles

Wintersberger, Eugen eugen.wintersberger at desy.de
Mon Nov 19 14:17:19 GMT 2012


Thanks Benjamin. I entirely forgot about the CIF-stuff. Has someone more
information about this CIF thing (except the famous 'Volume G')?
Is there already a milestone when we want to officially support CIF
angle descriptions?

regards
  Eugen

On Mon, 2012-11-19 at 15:04 +0100, Watts Benjamin wrote:
> Hi Eugen,
>    I think this issue is solved by the CIF-style angle descriptions that
> we discussed (and voted to accept) at the last NIAC.
> 
> Cheers,
> Ben
> 
> -----Original Message-----
> From: nexus-bounces at nexusformat.org
> [mailto:nexus-bounces at nexusformat.org] On Behalf Of Wintersberger, Eugen
> Sent: Montag, 19. November 2012 12:28
> To: nexus at nexusformat.org
> Subject: [Nexus] detector angles
> 
> Hi folks
>  it's me again. There is another issue concerning the polar coordinate
> frame. Though, the system as provided by Nexus is sufficient in the
> sense that it describes the position of the detector, it is rather
> uncommon as far it concerns coplanar diffraction. I cannot recall having
> used a diffractometer (neither in the lab nor at any beamline I have
> been) that uses such a coordinate frame. Instead of polar and azimuthal
> angle there are two detector angles as depicted in the PDF attached to
> this mail.  Is it possible that such a coordinate frame is common for a
> particular technique? If this is the case, would it be reasonable to
> extend the coordinate frame or shall users transform the two detector
> angles provided by their diffractometers to the polar and azimuthal
> angle as currently defined by Nexus. 
> 
> regards
>   Eugen
> 
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