![]() ![]() Now that we know that the pattern in a spectrum is easier to interpret if you plot it on an energy scale it does not matter what scale you choose, but many people still prefer the wavenumber scale. When Rydberg introduced the concept of wavenumber he was unaware of the fact that a wavenumber scale is proportional to an energy scale: he only used it as a mathematical manipulation to find a relation between the spectral lines of alkali atoms. We mention, though, that the Fano profiles observed in the HD-X spectra, Fig. ![]() Interference effects between allowed and induced phenomena have received attention 246, Most of the work reported to date is for liquids and thus outside the scope of this monograph. The distance of a point from y-axis scaled with the x-axis is called abscissa or x coordinate of the point. Fano profiles Durand P, Paidarova I, Gadea FX (2001) Theory of Fano profiles. Pronounced 'ab- siss -ah' (the c is silent). An ordered pair is used to denote a point in the Cartesian plane and the first coordinate (x), in the plane, is called the abscissa. one of three Cartesian coordinates that determine a position in space abscissa. Let's compare especially the peaks for $\ce. The abscissa is the x-coordinate of a point on the coordinate plane. Cartesian coordinate Add to list Share dimension. See the following comparison of units/values for the typical range of IR spectroscopy for organic compounds and some "example" values for the absorptions of common bond types: absorption cm⁻¹ m µm Hz THz J kJ/mol meV The goal is to be able to easily compare values. The choice to use wavenumbers for infrared spectroscopy (rather than wavelengths, frequencies, or energies) was probably done to provide a range that has both the appearance of width (so that the difference between two peaks is more meaningful) and spans a set of reasonable values that do not contain very large or very small numbers (which are hard to conceptualize). ![]()
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