PerkinElmer TORION T-9, User Manual

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Tools . 209
the window would be set to RI- of 400 and RI+ of 550. The Window value can be
changed in this dialog without changing the default setting in the method.
•
Max Hits
This setting by default is set to 5. The search results will show up to a
maximum of 5 possible matches from the search of the unknown library. If the search
only produces 1 or 2 possible compounds then only the number actually found will be
displayed. The number can be increased to the desired level.
Retention indexes were developed to make it possible to compare data from a variety of instruments
using similar columns but different oven programs. One of the most common indexes is the Kovats
index. All straight chain hydrocarbon molecules are assigned an index value of 100 per carbon. So a
molecule like heptane with 7 carbons would have a Kovats value of 700. And a molecule like
tetradecane with 14 carbons would have an index value of 1400.
Pressing the
Start Search button will activate a search using the settings. The following window
shows the search results for a compound that has five possible matches.

Search Results This section contains the results of the search and includes the following.
•
Compound This is the name of the compound as it exists in the library.
•
Library This is the name of the library used for the search.
•
Retention Index This is the retention index of the compound as it exists in the library.
•
Final Score
This number shows the goodness of fit. A
Final Score
of 100 would be a
perfect match. If the Library Search Spectra Graph is open a head tail of the
unknown spectra over the library spectra will be shown. Clicking on one of the other
compounds in the list will change the displayed information in the Library Search
Spectra Graph.
There are no reports generated for this information. It is only used for initial determination of
possible compounds that can be added to the Target Library Editor.
NIST
1. When selecting the NIST option from the right click popup menu an additional option will
appear. It is the Write Spectra to NIST File .