Depth Profiling

Etch Calibration

Translating sputtering time into physical depth requires calibrating the ion beam against a known reference material with a similar sputter yield. During depth profiling, the instrument registers changes in the concentration of individual elements like nickel, copper, and gold as each layer is stripped away. This step reveals whether the gold layer has been depleted or if the underlying nickel has migrated to the top surface.

Sputtering Limit

Physical distortions caused by preferential sputtering and atomic mixing can obscure the true width of thin interfaces during prolonged ion bombardment. These factors mean that depth profiling results must be interpreted carefully when analyzing deep boundaries where ion beam damage has accumulated. Utilizing lower primary ion beam energy helps maintain crisp resolution and limits the structural damage within the sputtered region.

Consequently, the chosen instrument parameters must balance analytical speed against the resolution requirements of the specific board finish under review, especially when examining ultra-thin layers that are prone to rapid degradation.