wavenumbers

The phase velocity dealt with the ratio of the center frequency of the wave to the center wavenumber of the wave, while the group velocity deals with the ratio of the range of frequencies in the wave to the range of wavenumbers in the wave.

Optics basics: Defining the velocity of a wave « Skulls in the Stars 2008

I realise the chemists in this field think in wavenumbers, but most people think in wavelengths.

Another Try EliRabett 2010

The x-axis is in frequency units, wavenumbers, used by spectroscopists.

Another Try EliRabett 2010

Suppose our wave consists of only of harmonic waves that lie within a range of frequencies Δω, and a corresponding range of wavenumbers Δk.

Optics basics: Defining the velocity of a wave « Skulls in the Stars 2008

The Rabett points to the bending and asymmetric stretching vibrations of CO2, but those are at much different wavenumbers than this mouse has ever seen them. 2565 cm-1?

Bunny's got a new puzzler EliRabett 2010

The dip at about 1000 wavenumbers is from absorption by ozone, the big dip at 675 wavenumbers is absorption by CO2.

Another Try EliRabett 2010

The indentation btw 600 and 800 wavenumbers is absorption in the CO2 bending vibration.

Rabett Run EliRabett 2009

The indentation btw 600 and 800 wavenumbers is absorption in the CO2 bending vibration.

Archive 2009-12-01 EliRabett 2009

I will note that even in the 375 ppm case there is a narrow peak in the middle of the 600-800 and around 1100 wavenumbers.

Rabett Run EliRabett 2009

An important spin-off is that when giving spectral information, the atom numbering given by InChI can be used to associate NMR shifts, and IR wavenumbers to atoms and atom groups, removing the ambiguity in those associations as we are used to find in literature.

Molecular Connectivity Tables in Images Egon Willighagen 2007