The New X-Ray Guy
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Transcript of The New X-Ray Guy
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The New X-Ray Guy1. Frankenthal / Mannheim2. La Chapelle Aux Bois3. Kasierslautern4. GttingenPeter MllerPeter Mueller
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The New X-Ray Guy
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The New Cryostream
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Judging the Quality of a Crystal.Determining the Best Exposure Time.Data Collection Strategy.And now: Some Crystallography
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Initial ImmagesJudging the Quality of the X-talTake two immages 90 appart.
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The Rocking CurveJudging the Quality of the X-talNumber of frames in both directionsSize of the boxhalfwidth =mosaicity
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Compare two (or more) immages that differ only in exposure time.
Does a longer exposure time add information to the immage?Determining the Exposure Time
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Determining the Exposure Time20 seconds is better than 10 seconds.
30 seconds not better than 20 sconds.
Our exposure time is20 seconds per frame.Always collect a new dark current at your exposure time or at least load an older (but not too old!) dark current taken at your exposure time.compare
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Collect Dark CurrentNow you are ready for data collectionWhat is the best strategy?
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The Platform Geometry
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phi- and omega-scansPhi-scans at different omega-anglesOmega-scans at different phi-anglesphi- and omega-scans are orthogonal...try to combine them!
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Collect Dark CurrentThree 200 omega-scansand two 360 phi-scansTwo 200 omega-scansand one 360 phi-scanthats plenty forany situation.is enough for mmm and higher.
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The Zero-Frames
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The Zero-Frames
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We have a new HOMEPAGEhttp://web.mit.edu/x-ray
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Next MeetingTuesday November 9, 11:00 a.m.AMDUR room (here)Data Reduction with SAINT and SADABS