Hypsochromic shift

Hypsochromic shift is a change of spectral band position in the absorption, reflectance, transmittance, or emission spectrum of a molecule to a shorter wavelength (higher frequency).

This can occur because of a change in environmental conditions: for example, a change in solvent polarity will result in solvatochromism. A series of structurally related molecules in a substitution series can also show a hypsochromic shift. Hypsochromic shift is a phenomenon seen in "molecular" spectra, not "atomic" spectra - it is thus more common to speak of the movement of the peaks in the spectrum rather than lines.

:Deltalambda = lambda^{mathrm{state 1_{mathrm{observed - lambda^{mathrm{state 2_{mathrm{observed where lambda is the wavelength of the spectral peak of interest and lambda^{mathrm{state 1_{mathrm{observed > lambda^{mathrm{state 2_{mathrm{observed

It is typically found using a spectrophotometer, colorimeter, or spectroradiometer.

Hypsochromic shifts are often referred to as blue shifts. Although this nomenclature is considered informal [http://www.iupac.org/reports/1996/6812verhoeven/B.htm#blueshift] , it is often used in the literature . It has no relation to Doppler shift or other wavelength-independent meanings of blueshift.

ee also

*Bathochromic shift, a change to longer wavelength (lower frequency)


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