Wavelengths Wavenumbers

Wavelength Wavenumber Refractive Thermal Conductivity, Thermal Expansion, ... 

Isoclinic point A wavelength, wavenumber, or frequency at which the first derivative of an absorption spectrum of a sample does not change upon a chemical reaction or physical change of the sample. 

Isooptoacoustic point A wavelength, wavenumber, or frequency at which the total energy emitted by a sample as heat does not change upon a chemical reaction or physical change of the sample. Its position depends on the experimental conditions. The spectral differences between the isosbestic points and the isooptoacoustic points are the result of the nonlinear relationship between the molar absorption coefficient and the photoacoustic signal. 

Wavenumber (Section 13.5A) A unit for the frequency of electromagnetic radiation that is inversely proportional to wavelength. Wavenumber, reported in reciprocal centimeters (cm ), is used for frequency in IR spectroscopy. 

P14.22 There are three isosbestic wavelengths (wavenumbers). The presence of two or more isosbestic points is good evidence that only two solutes in equilibrium with each other are present. The solutes here being Her(CNS)g and Her(OH)g. 

Wavenumber ( ) is another way to describe the frequency of electromagnetic radiation, and the one most often used in infrared spectroscopy. It is the number of waves in one centimeter, so it has units of reciprocal centimeters (cm ). Scientists use wavenumbers in preference to wavelengths because, unlike wavelengths, wavenumbers are directly proportional to energy. The relationship between wavenumber (in cm ) and wavelength (in m) is given by the equation... 

Table A.2.1 gives for radiation of a given energy the color, wavelength, wavenumber and frequency. The visible area corresponds to 400 < A < 700 nm ultraviolet radiation has A < 400 nm, infrared radiation A > 700 nm. In wavenumbers these regions are indicated as follows 14.300

It is common to use wavenumber, symbolized by either v or v, with units of cm, in describing IR spectra. The first symbol is called nu tilde the second symbol is called nu baf both symbols are used in the literature. The unit cm is called a reciprocal centimeter. The wavenumber is the reciprocal of the wavelength. Wavenumber is the number of waves of radiation per centimeter, 1 /A frequency is the number of waves per second, c/A. Wavelength and wavenumber are related by ... 

Relative Wavelength, Wavenumber, Raman shift. Raman shift. 

To determine the frequency, wavelength, wavenumber and energy change associated with an infrared transition. 

Huorolube , Polytrifluorochloroethylene, [-C2CIF3-] Polystyrene Wavenumber Calibration Wavelength-Wavenumber Conversion Table Diagnostic Spectra... 

The wavelength (wavenumber) of typical infrared spectrophotometers is often calibrated or verified with a standard spectrum of polystyrene, obtained from a polymer film. The wavelength match is also used as a diagnostic measure of spectrometer performance. The spectrum on the following page is that of polystyrene film (film thickness = 50 pm), and the table provides the wavenumber readings assigned to the peaks on the spectrum. - ... 

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