[3dem] FFT question

mike marko mike.marko.em at gmail.com
Fri Dec 29 11:34:24 PST 2017


We have seen this due to room vibration and/or noise in the room.

For example, we use a heavy-duty dehumidifier in the summer, and we need 
to turn it off if we want isotopic Thon rings.


On 12/29/2017 2:23 PM, Garry P Morgan wrote:
> Hi,
> we’re getting consistently clipped FFT’s on our TF30…the attached 
> image is from a 50-frame, summed/aligned image of the carbon (of a 
> cryo-grid). the drift numbers are reasonably low, there is no 
> astigmatism.  just wondering if any of you can provide a possible 
> explanation of this?  it definitely looks like drift or some sort of 
> movement, right?  we have 2 Gatan 626 holders, and it seems to only be 
> happening with one of the holders…has anyone encountered a problem 
> like this associated with a holder?
> thanks,
> Garry
>
> unknown.jpg
>
>
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