ChromeGate 3.3.2 Software Manual - KNAUER Advanced Scientific ...

190 ChromGate® PDA Option
Fig. 283
Library/Enabled
Enter the spectral library to be searched or select from available libraries
by clicking the Library field followed by clicking the file button. You can
select more than one library. To enable the library for searching, click the
Enabled box. If this list is empty, or no library is enabled, no hits will be
returned when a search is performed.
Search parameters
Enter the parameters to use for the search.
Wavelength range
Enter the wavelength range to search
Wavelength step
Enter a step number for the search. Larger numbers will make the search
faster, but if you use too large of a step, spectral details may not be
picked up.
Max hits
Specify the number of hits that will be reported in the results of a library
search. Note that this works in conjunction with the Similarity Threshold
parameter to limit the number of hits reported.
Similarity threshold
Enter a number for threshold of similarity. The library search results will
only display matches whose similarity to the unknown exceeds this value.
Pre-filters
The options in this group allow you to specify search pre-filters that will
be performed on library spectra prior to the test for similarity. All pre-filters
are optional.
Retention time range
When values are entered in these fields, PDA limits its search to library
spectra obtained from peaks whose apex is within the specified retention
time range. This pre-filter is optional and may be left blank.
Lambda max
When one or more of these values is specified, library search will be
restricted to those library entries containing lambda max value(s) within
5 nm of all of the specified values. Entries without matching lambda max