The basic sample carrier has the same performance as a single bounce diamond crystal and a broad spectral range which also covers the fingerprint region. It has a very high light throughput as the coupling area is large. The short optical path inside the ATR crystal makes the fingerprint region accessible.
The basic ATR crystal covers the full spectral range. Silicon is very hard and suitable for a pH range from 1 to 12. The crystal can have almost any rectangular shape. The graph shows the absorption of water on the basic ATR crystal compared to a standard single reflection diamond ATR crystal.