spectrum, parent monoisotopic mass isotope error

Syntax

The only two possible values for this parameter are yes or no.

Notes

  1. If no value, or an unexpected value is supplied, no error message is generated and the default value no is used.

Description

When the value for this parameter is yes, the parent ion mass tolerance is expanded by opening up multiple tolerance windows centered on the first and second 13C isotope peaks for a peptide. This behavior is necessary to compensate for the tendency of automated peak finding software to return the most intense peak from a cluster of isotopes, rather than the all-12C peak. It should only be used if the parent ion mass error parameters are set so that the error will be < 0.5 Da.

see also: spectrum, parent monoisotopic mass error plus | spectrum, parent monoisotopic mass error minus | spectrum, parent monoisotopic mass error units

X! TANDEM API description project