infra-red spectrometry

• what is the process of infra-red spectrometry?

  1. molecules absorb energy in form of infrared radiation which vibrates their bond
  2. different bonds absorb different frequencies of infra-red
  3. infra-red spectrum obtained by passing range of infra-red frequencies through compound
  4. absorption peaks formed
  5. peaks matched to known bond data to identify compound
• how do OH peaks appear on infra-red spectrometry?

  broad, smooth peaks
• how do CH peaks appear on infra-red spectrometry?

  narrow, sharp peaks
• what is the fingerprint region?

  part of spectrum below 1500cm-1 has many peaks

  caused by vibrations of whole molecule
• how are impurities determined?

  using infra-red spectrum
• how can impurities be detected?

  bonds absorb radiation, causing unexpected peaks