Chapter 3 Peak Detection and Labeling

The software uses the following formula to calculate the expected number of data points in a peak:

 

 

 

 

 

Flight time

 

 

Expected

=

 

to which the

 

 

number of

 

data point corresponds

 

 

data points

 

 

 

 

 

 

(2 × mass resolution × Bin size)

 

 

 

 

 

 

Where:

 

 

 

 

 

 

Mass resolution is a user-defined value.

 

 

Data-type-dependent defaults are provided, but can be overwritten.

 

 

Bin size is an instrumental constant:

 

 

·For Mariner data, Bin size = 1 ns.

 

 

·For Voyager data, Bin size is variable based on

 

 

 

the digitizer used and the mass range acquired.

3

 

 

Detection ranges Figure 3-1is an example of the resolution-based detection

 

 

ranges automatically calculated by the software.

 

 

 

 

 

 

 

Number

 

 

of data points 41 47 53 59 65 71

77

83

Figure 3-1 Example Detection Ranges Calculated by Software Based on Number

of Data Points Per Peak

3-4 Applied Biosystems