Experimental data, as well as reference spectra, can be stored in user libraries. It is very easy to create a user library, so don’t hesitate to organize your mass spectral, chromatographic and structural data in user libraries. Mass Frontier allows you to create highly annotated user libraries with structures. Both low- and high-resolution mass spectra are supported. Mass spectra can be stored as individual single spectra or as MSⁿ trees with multiple node spectra. Data reduced chromatograms with selected scans or components can be stored in user libraries and searched.

To create a user library, choose the Library | Spectral Library | Create User Library item in the main menu. When the Create User Library dialog window appears, follow these steps:

1. Enter or select the directory for the user library. We recommend accepting the default directory.
   
   
2. Enter the library name. Only the characters a-z, A-Z, space and 0-9 can be used.
   
   
3. Select the library icon.
   
   
4. Click the Create & Install User Library icon.

If the library has been successfully created the icon, name and path of the library will be displayed in the List of Installed Libraries grid. The program creates an individual subdirectory for each new library, complete with the name of the library. All the library data are stored in an *.mdf file. The full library path is displayed in the Directory column.

An unlimited number of user libraries can be created, but no more then 255 libraries may be installed in Mass Frontier at the same time. If, for whatever reason, you require more libraries to be installed, you can uninstall a library you do not temporarily need and create or install the library you wish to work with.

Note: A higher number of libraries will slow the program start, consume system resources and potentionally lengthen the search processes.