> >>XIONGJP at UOXRAY.UOREGON.EDU wrote:
> >> I collected a dataset at about 20 degree of chi angle. But I can
> >> remember the exact chi value. What is the consequence when using
> >> the approximate value?
>> >It is absolutely irrelevant what the value of chi in 3-circle goniostat
> >was during data collection, as long as it was constant during
> >series of oscillation images. What is important that oscillation motion
> >is done with omega motor.
>> Actually, the data collection is in phi scan. My understanding is that
> I should input the accurate chi angle in DENZO for my case. If so, is
> there any way to fix the problem caused by the inaccurate chi angle?
> And also, why the chi**2's for y increase from about 1.0 to 4.8 with the
> phi angle increases(phi scan) but chi**2's for x remain constant at about 1.0?
> Thanks in advance for any suggestion.
If the phi axis was perpendicular to the beam direction, then
there is some hope. One shuld enter as cassette rotz the angle
between omega axis and phi axis. However, polarization correction will
be somewhat inaccurate.
If phi axis was not perpendicular to the beam direction, one should
wait for the future version of Denzo that will handle such data.
-
Zbyszek Otwinowski | zbyszek at chop.swmed.edu
University of Texas | tel : (214)-648-5098
Southwestern Medical Center | fax : (214)-648-5095
5323 Harry Hines Boulevard Dallas, Texas 75235-9038
[EOB]
