Rider Peak

In a series of non-resolved peaks, all peaks - with the exception of the largest peak (reference peak) - are referred to as rider peaks. Alternatively, they are called skimming peaks.

Depending on the position of the rider peak (on the leading or trailing edge of the reference peak), a distinction is made between rider up and rider down.

Use the Rider Threshold and Maximum Rider Ratio detection parameters to determine the peaks that are classified as rider peaks within a series of non-resolved peaks.

A skimming tangent on the chromatogram plot indicates the peaks that are classified as rider peaks. In the result report, they are labeled Ru (Rider up) or Rd (Rider down).

Rider peaks can be skimmed in different ways (see Rider Skimming).

 Tips:

You can move the baseline in the chromatogram with the mouse for tangentially skimmed riders, but you cannot for exponentially skimmed riders.

Split Peak on the context menu allows splitting one rider peak into two peaks.

Rider peaks are different from Peak Shoulders but the transitions can be smooth. Peak shoulders normally do not have a distinct separate relative signal maximum of their own. Unlike peak shoulders, Rider Peaks usually do have a distinct relative maximum of their own.

For more information about rider peaks, refer to Integrating Chromatograms and Identifying Peaks/Defining Detection Parameters  Defining Rider Peaks.