The IR Spectrum Table is a chart for use during infrared spectroscopy. The table lists IR spectroscopy frequency ranges, appearance of the vibration and absorptions for functional groups. There are two tables grouped by frequency range and compound class.

IR Spectrum Table by Frequency Range

Use this table when you already know the frequency of your material. Find the frequency range in the first column on the left side of the chart and corresponding values in adjacent columns.

If you need to find the frequency of a material go to the IR table by compound.

Table 1

IR Table by Compound Class

If you are looking up the absorption of a particular compound class, use this IR spectrum chart. If you already know the frequency, use the IR frequency table above.

Table 2

How to Read an IR Spectrum Table

To use an IR spectrum table, first find the frequency or compound in the first column, depending on which type of chart you are using. Then find the corresponding values for absorption, appearance and other attributes. The value for absorption is usually in cm-1.

Note that not all frequencies have a related compound.