To expand the capabilities of the microwave frequency alternating current scanning tunneling microscope to include the ability to study isolated adsorbates and highly reactive surfaces, we have developed a low temperature, ultrahigh vacuum alternating current scanning tunneling microscope. In this alternating current scanning tunneling microscope, we employ the reliable beetle‐style sample approach mechanism with a number of other components unique to a low temperature scanning tunneling microscope. These include the sample transfer, delivery, retrieval, storage, sputtering, and heating systems. This alternating current scanning tunneling microscope operates at 77 and 4 K.

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This mirror is particularly useful for the cryogenic ACSTM, but its use must be limited to prevent unnecessary radiative heating.
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The sample holder’s symmetry is reduced by milling notches in the back side of the holder in random locations. This does not change the normal operation of the STM. It merely lowers the resonance amplitude.
14.
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15.
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16.
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19.
Note that the ball screw is manufactured with nylon bearing deflectors which we have replaced with Cu replicas machined for use in UHV.
20.
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21.
The ball screw has been replaced in other versions of this elevator assembly by a welded bellows linear feedthrough. This provides comparable performance to the ball screw assembly and is commercially available without the need for modification.
22.
This means of sample centering reduces the number of times that the vertical translator must be used. This reduces the thermal load on the cryostat and maintains all parts of the low temperature ACSTM at cryogenic temperatures after the sample is dropped off by the vertical translator.
23.
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24.
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