In 1991, American Patent Bureau Published the Patent of Photon Scanning Tunnel- ing Microscopy CUSP 5,018,865). Now we name that instrument 1st generation PSTM. Our group obtained first PSTM image of a holographic grating with resolution of 100nm october 1991, and super-resolution images with lateral beter than 10nm and longitude bet- ter than 1nm, using the 1st generation PSTM in 1993.
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