The Physics Of Infrared Radiation - 1086 Words

A vibration can result in an absorption peak of infrared radiation, only if there is a change in the dipole moment of the molecule. The larger this change, the more intense will be the absorption band. Furthermore, the electron polarity vectors in the covalent bond should not cancel out i.e the covalent bonds must be asymmetric. Asymmetrical bonds carry a net polarity vector and show absorption peaks; bonds that are centered along the plane of symmetry cancel out their polarity vectors upon stretching and there is no net change in dipole moment. Such molecules are known to be infrared inactive. An infrared spectrum is the plot of absorbance (or % transmission) against the wavenumber (cm-1) (Rehman et al., 2012). Wavenumber is defined as number of waves in a length of one centimeter and is a commonly used unit for representing spectral regions. Wavenumber is linear with energy and is expressed with the following equation.Significant parts of the spectrum are the regions where the molecule absorbs the infrared energy. These are shown as characteristic absorption peaks. A molecule can only absorb radiation when the incoming infrared radiation is of the same frequency as one of the fundamental modes of vibration of the molecule (Stuart and Barbara, 2004). The modes of vibration usually encountered include bending, stretching, wagging and out of plane vibrations. These molecular vibrations result in changes in dipole moments of the molecular groups and the resulting vibratingShow MoreRelatedConduction, Convection, and Radiation1525 Words   |  7 PagesConduction, Convection, and Radiation By: Spencer Smith Physics 2010 – Online Dr. Stone 30 April 2014 Physics is a controlling factor in our vast universe. 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