A method of fabricating a double tapered scanning tunneling microscope comprises immersing one end of {HEAD ~ the tip} in a bath of an acidic aqueous etchant solution containing an alkaline earth salt, with the wire positioned substantially perpendicularly to the surface of the solution; and etching the wire at about 25 volts root mean squared alternating current until {TAIL ~ a double tapered tip} is formed thereon 
A method of fabricating a double tapered scanning tunneling microscope comprises immersing one end of { HEAD ~ the tip } in a bath of an acidic aqueous etchant solution containing an alkaline earth salt , with the wire positioned substantially perpendicularly to the surface of the solution ; and etching the wire at about 25 volts root mean squared alternating current until { TAIL ~ a double tapered tip } is formed thereon
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