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The letter introduces a diagram that rationalizes tunneling atomic forcemicroscopy (TUNA) observations of electron emission from polycrystallinediamonds as described in recent publications. The direct observations ofelectron emission from grain boundary sites by TUNA could indeed be evidence ofelectrons originating from grain boundaries under external electric fields. Atthe same time, from the diagram it follows that TUNA and field emission schemesare complimentary rather than equivalent for results interpretation. It isfurther proposed that TUNA could provide better insights into emissionmechanisms by measuring the detailed structure of the potential barrier on thesurface of polycrystalline diamonds.

Scanning probe microscopy and field emission schemes for studying electron emission from polycrystalline diamond