Local heterogeneity limits in SPM microscopy: Difference between revisions
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★ all accessible structure to jump back and forth between to must fit into the imageable area. <br> | ★ all accessible structure to jump back and forth between to must fit into the imageable area. <br> | ||
== Present challenges needing solving | == Present challenges needing solving == | ||
* Difficult inclusion of other modes of microscopy (and fiducial marker making means) into UHV SPM systems particularly with deep cryo shields. | * Difficult inclusion of other modes of microscopy (and fiducial marker making means) into UHV SPM systems particularly with deep cryo shields. | ||
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* [[Why force applying mechanosynthesis should work in brief]] | * [[Why force applying mechanosynthesis should work in brief]] | ||
* [[SPM needle tip apex to sample approach Moon landing analogy]] | * [[SPM needle tip apex to sample approach Moon landing analogy]] | ||
* [[Surface molecular system]] | |||
Latest revision as of 14:56, 30 March 2026
Scanning probe microscopy has a limited range of imaging motion.
As of 2026 there are still no methods to find a nanoscale spot again after moving away
by a macroscale distance like e.g. a few millimeters to centimeters.
It is not just that there ore no yet well established methods yet but more like.
that there are still not methods present at all.
Consequently originating from this still present severely limiting restriction …
★ no methods to quickly jump back and forth between farther apart places are available either.
★ all accessible structure to jump back and forth between to must fit into the imageable area.
Present challenges needing solving
- Difficult inclusion of other modes of microscopy (and fiducial marker making means) into UHV SPM systems particularly with deep cryo shields.
- Optical microscopy being very limited in resolution not or barely overlapping the entire SPM imageable area
- Electron microscopy being quite destructive on nanostructures
- Electron and ion beam lithography being processes that dirty a very good UHV as needed for mechanosynthesis experiments with many open radicals
- Finding and combining actuators of different distance range capabilities to make possible and sufficiently fast
a position re-calibration process using:
(A) local surface features and (B) possible added fiducials
For mechanosynthesis the SPM tip may be functionalized with an adapter molecule and thus
a quick rough scan over a sample surface that is very rough from crude larger scale fiducials
could cause some tip surface crashes and is thus not an option.
Codeposition limits (& opportunities)
There are certain surface molecular system compatibility constraints.
Just some examples:
★ Silicene is mostly grown on solver as it works best there some but rare on other base metals.
★ Graphene nanoribbons (GNRs) are mostly made with on surface synthesis on gold.
… Grapghitic molecules on silicon, germanium and other semiconductors or non-coinage metals
… are much more rare possibly pointing to significantly higher experimental difficulty
There are certain opportunities.
Just some examples:
★ GNRs synthesis can leave open gold surface patches between the ribbons for further post depositions that only stick to the gold not the ribbons.
★ Salt islands on coinage metals serving as molecular ionic state charge stabilization insulator testbeds