SECM Cornut-Lefrou Approach Curve Fitter

Paste distance-current data, fit a negative-feedback SECM approach curve, and extract tip radius, surface offset, bulk current, residual error, and normalized approach curve parameters.

Input data

Data table

Accepted separators: comma, tab, semicolon, or spaces. Lines starting with # are ignored. Use distance in um and current in nA.

Model

Radius guess / um

RG = r_glass/a

Surface offset, z0 / um Fix z0

Bulk current, i_inf / nA

Model convention: L = (d - z0) / a. Current model: i = i_inf * I_CL(L, RG). No current offset/baseline is fitted. If Fix z0 is checked, the entered offset is held constant during fitting.

Fit results

Tip radius, a-

Surface offset, z0-

Bulk current, i_inf-

RMSE-