Processing method: Integration Events ChemStation: Advanced

The advanced integration events are provided for all signals.

Tangent skim modeTangent skim mode

Define the type of baseline construction for peaks found on the upslope or downslope of a peak. See Tangent skim modes.

Exponential	Draws an exponential curve through the height-corrected start and end of each child peak.
New Exponential	Draws an exponential curve to approximate the trailing edge of the parent peak.
Standard	Combines exponential and straight line calculations for best fit.
Straight	Draws a straight line through the height-corrected start and end of each child peak.
Gaussian	Draws an gaussian curve to approximate the trailing edge of the parent peak.

Tail skim height ratioTail skim height ratio

Together with the Skim valley ratio, sets the conditions for tangent skimming a small peak on the tail of a solvent or other large peak. See Skim criteria.

It is the ratio of the height of the baseline-corrected parent peak (Hp) to the height of the baseline-corrected child peak (Hc). Ratios higher than the specified value will enable skimming.

Example: Peak with tail skimming

Front skim height ratioFront skim height ratio

Together with the Skim Valley Ratio, sets the conditions for tangent skimming a small peak on the front of a solvent or other large peak. See Skim criteria.

It is the ratio of the height of the baseline-corrected parent peak (Hp) to the height of the baseline-corrected child peak (Hc). Ratios higher than the specified value will enable skimming.

Example: Peak with front skimming

Skim valley ratioSkim valley ratio

Together with the Tail Skim Height Ratio or Front Skim Height Ratio, sets the conditions for tangent skimming a small peak on the tail or front of a solvent or other large peak. See Skim criteria.

It is the ratio of the height of the baseline-corrected child peak (Hc) to the height of the baseline-corrected valley (Hv). Ratios lower than the specified value will enable skimming.

Example: Peak with tail skimming

Baseline correction modeBaseline correction mode

Sets the type of baseline correction. See Baseline correction modes.

You can choose between the following parameters:

Classical	Accepts baseline penetrations.
No penetrations	Removes baseline penetrations by reconstructing the baseline.
Advanced	The integrator tries to optimize the start and end locations of the peaks, re-establishes the baseline for a cluster of peaks and removes baseline penetrations.
Advanced+	The integrator tries to optimize the shoulder detection. This increases shoulder sensitivity, and at the same time reduces the number of shoulder artefacts.

Peak-to-Valley ratioPeak-to-Valley ratio

Used to decide whether two peaks that do not show baseline separation are separated using a drop line or a valley baseline, it is the ratio of the baseline-corrected height of the smaller peak to the baseline-corrected height of the valley. See Peak valley ratio.

When the peak to valley ratio is lower than the specified value, a drop line is used (A); otherwise, a baseline is drawn from the baseline at the start of the first peak to the valley, and from the valley to the baseline at the end of the second peak (B).

Effect of peak valley ratio on the baselines