Applying a new programme of treating STM spectrum with the method of ex-citon dynamics, we obtained the formula relating the tunnelling current with the position of the tip about the N adsorbate's STM system under the condition that the purely coherent memory functions being independent of time, and discussed the range of application. As an example of application, we simulated the dimer adsorbate's STM spectra of Au(110)2×1, and 3×1 reconstructed surfaces. The reaul-tes ar...
