Agilent InfinityLab LC Series Diode Array Detectors User Manual 91
5 Optimizing the Detector
Optimizing for Sensitivity, Selectivity, Linearity and Dispersion
Figure 26 Benzene at 1 and 4 nm slit width (principle)
A wide slit uses more of the light shining through the flow cell. This gives lower
baseline noise as shown in Figure 27 on page 91.
Figure 27 Influence of the Slit Width on Baseline Noise
However, with a wider slit, the spectrograph’s optical resolution (its ability to
distinguish between different wavelengths) diminishes. Any photodiode receives
light within a range of wavelength determined by the slit width. This explains why
the fine spectral structure of benzene disappears when using a 8 nm wide slit.
Data Rate = 160 Hz
Slit width = 8 nm
Slit width = 1 nm
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