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