Morton's theorem: Difference between revisions
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'''Bathochromic shift''' is a change of spectral band position in the [[absorption spectrum|absorption]], [[reflectance]], [[transmittance]], or [[emission spectrum]] of a molecule to a longer [[wavelength]] (lower [[frequency]]).<ref>{{GoldBookRef|title=bathochromic shift (effect)|url=http://goldbook.iupac.org/B00618.html}}</ref> | |||
Because the [[red]] color in the [[visible spectrum]] has a longer wavelength than most other colors, this effect is also commonly called a '''red shift''', although this usage is considered informal,<ref>[http://www.iupac.org/reports/1996/6812verhoeven/R.htm#redshift Glossary of Terms Used in Photochemistry]</ref> and has no relation to [[Doppler shift]] or other wavelength-independent meanings of [[redshift]]. This usage is often found in the [[scientific literature]]<!-- Reference here when I get a chance - Stillnotelf -->. | |||
This can occur because of a change in environmental conditions: for example, a change in solvent [[Chemical polarity|polarity]] will result in [[solvatochromism]]. A series of structurally related molecules in a [[Substitution (chemistry)|substitution]] series can also show a bathochromic shift. Bathochromic 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. | |||
:<math>\Delta\lambda = \lambda^{\mathrm{state 2}}_{\mathrm{observed}} - \lambda^{\mathrm{state 1}}_{\mathrm{observed}}</math> where <math>\lambda</math> is the wavelength of the spectral peak of interest and <math>\lambda^{\mathrm{state 2}}_{\mathrm{observed}} > \lambda^{\mathrm{state 1}}_{\mathrm{observed}}</math> | |||
Bathochromic shift is typically demonstrated using a [[spectrophotometer]], [[Tristimulus colorimeter|colorimeter]], or [[spectroradiometer]]. | |||
==References== | |||
{{Reflist}} | |||
==See also== | |||
* [[Hypsochromic shift]], a change to shorter wavelength (higher frequency) | |||
[[Category:Chromism]] | |||
[[Category:Spectroscopy]] | |||
[[it:Iperconiugazione]] | |||
Revision as of 23:45, 9 December 2012
Bathochromic shift is a change of spectral band position in the absorption, reflectance, transmittance, or emission spectrum of a molecule to a longer wavelength (lower frequency).[1]
Because the red color in the visible spectrum has a longer wavelength than most other colors, this effect is also commonly called a red shift, although this usage is considered informal,[2] and has no relation to Doppler shift or other wavelength-independent meanings of redshift. This usage is often found in the scientific literature.
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 bathochromic shift. Bathochromic 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.
Bathochromic shift is typically demonstrated using a spectrophotometer, colorimeter, or spectroradiometer.
References
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See also
- Hypsochromic shift, a change to shorter wavelength (higher frequency)