The wavenumber is defined as the reciprocal of wavelength (Formula 6.3), and the wavenumbers of infrared radiation are normally in the range of 4000 cm -1 to 600 cm -1 (approximate corresponds the wavelength range of 2.5 μm to 17 μm of IR radiation).

The document is an IR spectrum table that lists infrared spectroscopy frequency ranges, the appearance of vibrations and absorptions for different functional groups. It contains two tables - one grouped by frequency range showing the wavenumber range, absorption strength and associated functional groups.

Department of Chemistry and Biochemistry Research Analytical Lab FT-IR Spectroscopy IR Absorption Frequencies

Fourier transform infrared spectroscopy (FTIR) [1] is a technique used to obtain an infrared spectrum of absorption or emission of a solid, liquid, or gas. An FTIR spectrometer simultaneously collects high-resolution spectral data over a wide spectral range.

You can download this chart as a printable acrobat pdf file.

Conversion Table of Energy and Wavelength Units for Near Infrared, Visible and UV

This webinar gives a presentation on FTIR Theory and Instrumentation, which includes an introduction to the theory of IR spectroscopy – wavelength range, bond energies, and functional groups.

Wavenumber defines the number of waves per unit length. Thus, wavenumbers are directly proportion- al to frequency, as well as the energy of the IR absorption. The wavenumber unit (cm–1, reciprocal cen- timeter) is more commonly used in …

Radiation in the infrared region is commonly referred to in terms of a unit called a wavenumber (ν), rather than wavelength (λ). Wavenumbers are expressed as reciprocal centimeters (cm-1) and are the preferred unit as they are directly proportional to energy.

4 days ago · Example of an FTIR spectrum comparing two samples, with overlaid absorbance spectra shown in green and red. The x-axis represents wavenumber (cm⁻¹), while the y-axis indicates absorbance.