[Spm] Sharp STM tips

[Don Chernoff at ASM]

Dear Colleagues:

How would one get or make STM tips with the following characteristics:
-apex has 1 nm radius of curvature (or less)
-opening angle (or cone angle) in the 5 nm above the apex is less than 60 degrees (full angle)
-tip material is stable in air 
-can achieve atomic resolution

regards,
Don
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Don Chernoff, Ph.D., President
Advanced Surface Microscopy, Inc.    E-Mail:  donc at asmicro.com
3250 N. Post Rd., Ste. 120           Voice:   317-895-5630
INDIANAPOLIS IN 46226  USA      Toll free: 800-374-8557 (in USA & Canada)
web:  http://www.asmicro.com         Fax:     317-895-5652
[business activities:  analytical services in AFM, AFM probes, consulting, training,
calibration and test specimens, calibration and measurement software,
 used NanoScope equipment.] 2009-2010 is our 20th year in business!
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