[Ifeffit] Brainteaser

Matthew Marcus mamarcus at lbl.gov
Thu Apr 3 20:30:21 CDT 2008

MessageThe most obvious explanation for why the post-edge scans line up and the pre-edges don't is that the transmission chamber
current amp or V/F is saturated and reads a fixed value below the edge.  As the ring current decays, I0 goes down while
It is fixed below the edge, so ln(I0/It) decreases as observed.  With this explanation, and noting that ln(I0/It)
decreased by about 0.05 in an hour, I infer that the stored-beam lifetime is ~20hr.
  ----- Original Message ----- 
  From: Anatoly Frenkel 
  To: anatoly.frenkel at yu.edu ; 'XAFS Analysis using Ifeffit' 
  Sent: Thursday, April 03, 2008 6:13 PM
  Subject: [Ifeffit] Brainteaser

  Attached is a brainteaser which I think is cute. Too late for the April fool's day but still... 
  Some comments: three consecutive scans of the same sample were taken in this order: scan 1, 2 and 3. Duration: 30 minutes per scan.

  If these data look unusual to you please tell us why and what could've happened in this experiment. 

  Those of you who send first three correct answers will be acknowledged!



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  Ifeffit at millenia.cars.aps.anl.gov
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