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- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_II_(Morsch_et_al.)/12%3A_Structure_Determination_-_Mass_Spectrometry_and_Infrared_Spectroscopy/12.06%3A_Infrared_SpectroscopyIf a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrationa...If a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrational energy state - what this means is that the amplitude of the vibration will increase, but the vibrational frequency will remain the same.
- https://chem.libretexts.org/Courses/can/CHEM_231%3A_Organic_Chemistry_I_Textbook/13%3A_Structure_Determination_-_Mass_Spectrometry_and_Infrared_Spectroscopy/13.08%3A_Infrared_SpectroscopyIn infrared (IR) spectroscopy, the IR region of the electromagnetic spectrum covers the range from just above the visible (7.8 × 10 –7 m) to approximately 10 –4 m, but only the midportion from 2.5 × 1...In infrared (IR) spectroscopy, the IR region of the electromagnetic spectrum covers the range from just above the visible (7.8 × 10 –7 m) to approximately 10 –4 m, but only the midportion from 2.5 × 10 –6 m to 2.5 × 10 –5 m is used by organic chemists (Figure \PageIndex1. When a molecule is irradiated with electromagnetic radiation, energy is absorbed if the frequency of the radiation matches the frequency of the vibration.
- https://chem.libretexts.org/Ancillary_Materials/Reference/Organic_Chemistry_Glossary/WavenumberThe wave number of a monochromatic light beam is the inverse of its wave length.
- https://chem.libretexts.org/Courses/Northern_Alberta_Institute_of_Technology/CHEM1130_Principles_in_Chemistry_I/4%3A_Chemical_Calculations/4.7%3A_Overview_of_SpectroscopyThe focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they of...The focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they often are identified as optical spectroscopies. For convenience we will use the simpler term spectroscopy in place of optical spectroscopy; however, you should understand that we are considering only a limited part of a much broader area of analytical techniques.
- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_(Morsch_et_al.)/12%3A_Structure_Determination_-_Mass_Spectrometry_and_Infrared_Spectroscopy/12.06%3A_Infrared_SpectroscopyIf a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrationa...If a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrational energy state - what this means is that the amplitude of the vibration will increase, but the vibrational frequency will remain the same.
- https://chem.libretexts.org/Workbench/LCDS_Organic_Chemistry_OER_Textbook_-_Todd_Trout/12%3A_Structure_Determination_-_Mass_Spectrometry_and_Infrared_Spectroscopy/12.07%3A_Infrared_SpectroscopyIn infrared (IR) spectroscopy, the IR region of the electromagnetic spectrum covers the range from just above the visible (7.8 × 10 –7 m) to approximately 10 –4 m, but only the midportion from 2.5 × 1...In infrared (IR) spectroscopy, the IR region of the electromagnetic spectrum covers the range from just above the visible (7.8 × 10 –7 m) to approximately 10 –4 m, but only the midportion from 2.5 × 10 –6 m to 2.5 × 10 –5 m is used by organic chemists (Figure 12.20. When a molecule is irradiated with electromagnetic radiation, energy is absorbed if the frequency of the radiation matches the frequency of the vibration.
- https://chem.libretexts.org/Courses/Smith_College/Organic_Chemistry_(LibreTexts)/12%3A_Structure_Determination_-_Mass_Spectrometry_and_Infrared_Spectroscopy/12.07%3A_Infrared_SpectroscopyIf a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrationa...If a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrational energy state - what this means is that the amplitude of the vibration will increase, but the vibrational frequency will remain the same.
- https://chem.libretexts.org/Courses/Western_Washington_University/Biophysical_Chemistry_(Smirnov_and_McCarty)/04%3A_Spectroscopy_-_Types_Key_Features_Examples/4.02%3A_Two_Masses_on_a_Spring_Model_and_Infrared_(IR)_Spectroscopyhis Chapter presents a basic view of a classical physics model of ???two masses on a spring??? and shows how this model can help understand and interpret infrared (IR) spectroscopy data. This will be ...his Chapter presents a basic view of a classical physics model of ???two masses on a spring??? and shows how this model can help understand and interpret infrared (IR) spectroscopy data. This will be one of our examples of some theoretical foundation for a certain type of spectroscopy. This theory-experiment connection is important for every type of spectroscopy because spectroscopic data always need to be interpreted and it is not possible without a sufficiently accurate theory.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/11%3A_Spectroscopic_Methods/11.01%3A_Overview_of_SpectroscopyThe focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they of...The focus of this chapter is on the interaction of ultraviolet, visible, and infrared radiation with matter. Because these techniques use optical materials to disperse and focus the radiation, they often are identified as optical spectroscopies. For convenience we will use the simpler term spectroscopy in place of optical spectroscopy; however, you should understand that we are considering only a limited part of a much broader area of analytical techniques.
- https://chem.libretexts.org/Courses/Smith_College/CHM_222_Chemistry_II%3A_Organic_Chemistry_(2025)/05%3A_Structure_Determination_-_Mass_Spectrometry_(reference_only)_and_Infrared_Spectroscopy/5.07%3A_Infrared_SpectroscopyIf a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrationa...If a molecule is exposed to electromagnetic radiation that matches the frequency of one of its vibrational modes, it will in most cases absorb energy from the radiation and jump to a higher vibrational energy state - what this means is that the amplitude of the vibration will increase, but the vibrational frequency will remain the same.
- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_(OpenStax)/12%3A_Structure_Determination_-_Mass_Spectrometry_and_Infrared_Spectroscopy/12.06%3A_Infrared_SpectroscopyWhy does an organic molecule absorb some wavelengths of IR radiation but not others? All molecules have a certain amount of energy and are in constant motion. Their bonds stretch and contract, atoms w...Why does an organic molecule absorb some wavelengths of IR radiation but not others? All molecules have a certain amount of energy and are in constant motion. Their bonds stretch and contract, atoms wag back and forth, and other molecular vibrations occur
