Surface Analysis
Surface identification of organic contaminants relies on analytical techniques utilizing infrared radiation to probe molecular bonds. When performing ftir-atr spectroscopy, an infrared beam passes through a high-refractive-index crystal in contact with the specimen to create an evanescent wave. This wave penetrates a few micrometers into the material to capture a chemical signature without requiring complex sample preparation.
Laboratories use this method to identify solder mask residues or mold release agents on bonding pads.
Interface Quality
Effective interaction with the target substance requires a specific amount of force between the probe and the sample. The Contact Pressure of ftir-atr spectroscopy ensures that the evanescent wave captures a clear signal. Insufficient coupling between the internal reflection element and the printed circuit board leads to weak signals.
Detection Limit
Distinguishing between similar polymer structures requires a high degree of detail in the collected infrared data. The Spectral Resolution of ftir-atr spectroscopy allows for the detection of oxidation failures in epoxy systems. Characteristic peaks in the fingerprint region identify degraded resin components.
While the technique excels at identifying bulk organic species, it lacks the sensitivity to find trace metallic ions or extremely thin molecular layers. Most quality control workflows pair this data with ion chromatography for a complete assessment of board cleanliness.
