Calculates the access resistance for the open pore at the tip of a SICM pipette, using the approximation due to Hall (1975).
resist.access(r, rho = 51)
Radius of the pipette tip opening.
Resistivity of the surrounding conductive material, in ohm centimetres. The default value of 51 ohm cm corresponds to a 150 mM solution of KCl.
The calculated access resistance, in ohms.
Hall, James E. 1975 Access resistance of a small circular pore. J. Gen. Physiol., 66(4), 531–532
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# access resistance to a 50nm pipette tip in solution of resistivity 64 ohm cm # converting result from ohms to megohms for readability resist.access(r=0.05, rho=64) * 1e-6
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