Library inverted lists

With this method, selected data keys are defined and the data are arranged in new files that contain the information on the individual data sets. Consider an inverted list for a spectral library in the IR range (Figure 7.6). The key consists here of the numbered spectral features, that is, in this example, the wavenumbers representing absorption maxima. 

Figure 7.6 Inverted list for an IR spectral library. ID Identity number of...

The second stage is to conduct a computer search of an appropriate database or library, for example of drugs, to test for an exact match or to compile an inverted list (Topic H4). 

Searching spectral libraries may involve the use of inverted lists. These consist of each characteristic absorption band or emission line along with a list of corresponding numbered library spectra that include that particular band or line. A list for the spectrum of an unknown analyte can then be rapidly checked against the library lists. An example of part of an inverted list for an infrared spectral library is shown in Figure 1. It includes spectrum No. 66 among those listed with an absorbance band at 1220 cm and spectrum No. 105 among those listed with an absorbance band at 2730 cm . ... 

Fig, 1, Part of an inverted list for an infrared spectral library. 

MY FATHER AND his visitor spent the rest of the day in the library while I worked on the rose. We intended to let it dry in a sealed container so that it would not be contaminated by insects or dust. After listing, measuring, and sketching the flower s various parts, I dried its stem and placed it in a clean flask. Then I inverted another,... 

---