<P> The infrared spectrum of a sample is recorded by passing a beam of infrared light through the sample . When the frequency of the IR is the same as the vibrational frequency of a bond or collection of bonds , absorption occurs . Examination of the transmitted light reveals how much energy was absorbed at each frequency ( or wavelength ) . This measurement can be achieved by scanning the wavelength range using a monochromator . Alternatively , the entire wavelength range is measured using a Fourier transform instrument and then a transmittance or absorbance spectrum is generated using a dedicated procedure . </P>
<P> The infrared spectrum of a sample is recorded by passing a beam of infrared light through the sample . When the frequency of the IR is the same as the vibrational frequency of a bond or collection of bonds , absorption occurs . Examination of the transmitted light reveals how much energy was absorbed at each frequency ( or wavelength ) . This measurement can be achieved by scanning the wavelength range using a monochromator . Alternatively , the entire wavelength range is measured using a Fourier transform instrument and then a transmittance or absorbance spectrum is generated using a dedicated procedure . </P>
2 . describe the conditions for ir absorption to occur
2 . describe the conditions for ir absorption to occur
When the frequency of the IR is the same as the vibrational frequency of a bond or collection of bonds
When the frequency of the IR is the same as the vibrational frequency of a bond or collection of bonds