Slit Width (G4212A) - Agilent Technologies 1200 Infinity Series User Manual

5
Optimizing the Detector
Optimizing for Sensitivity, Selectivity, Linearity and Dispersion

Slit Width (G4212A)

The 1290 Infinity DAD (G4212A) has a variable slit at the entrance of the
spectrograph. This is an effective tool to adapt the detector to changing
demand of different analytical problems.
A narrow slit provides spectral resolution for analytes with very fine
structures in the absorbance spectrum. An example of such a spectrum is
benzene. The five main absorbance bands (fingers) are only 2.5 nm wide and
just 6 nm apart from each other.
Figure 23
A wide slit uses more of the light shining through the flow cell. This gives
lower baseline noise as shown in
92
Benzene at 1 and 4 nm slit width (principle)
Figure 24 on page 93.
Agilent 1200 Infinity Series DAD User Manual