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projects:stm:log [2025/07/13 10:53] – [Day 2025-07-12 (k8ik, rahix)] rahixprojects:stm:log [2025/08/03 15:56] (current) – [Day 2025-08-02 (k8ik, q3k, rahix)] rahix
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 ====== Lab Notes for the Scanning Tunneling Microscope ====== ====== Lab Notes for the Scanning Tunneling Microscope ======
  
 +==== Day 2025-08-02 (k8ik, q3k, rahix) ====
 +Tried imaging the DVD surface under the SEM for reference.  Had a bit of trouble getting an image to become visible -> turns out that the surface is only visible at low acceleration voltages and becomes very invisible the higher it gets.  Finally worked well at 5kV and using SE imaging mode.
 +
 +The samples were prepared by lifting the bottom plastic off the DVD such that the aluminum foil sticks to the remaining plastic which also has the label printed on its back.  So we are looking at the sample from the same side as the DVD drive laser.
 +
 +{{:projects:stm:dvd-surface-uncalibrated.png?400|}}
 +
 +(The dimensions are off, because of our SEM not being calibrated properly)
 +
 +We now know that our samples are good and we should be able to image them on the STM!  Also found some prior art of imaging DVD surfaces with an STM, further corroborating that this approach will work: 
 +
 +  - [[http://www.joniemeyer.com/jo_niemeyer/STM.html|jo niemeyer STM]] ([[https://web.archive.org/web/20210518134908/http://www.joniemeyer.com/jo_niemeyer/STM.html|archive.org]])
 +  - [[https://hackaday.io/project/29332-the-pvc-scanning-tunneling-microscope/log/81900-samples-to-use-on-the-stm|DVD+R imaging on the "PVC scanning tunneling microscope"]]
 ==== Day 2025-07-12 (k8ik, rahix) ==== ==== Day 2025-07-12 (k8ik, rahix) ====
 Rebuilt the experiment to the last state (oscillscope for live viewing, red pitaya for acquisition and x/y control, lab power supply). Rebuilt the experiment to the last state (oscillscope for live viewing, red pitaya for acquisition and x/y control, lab power supply).