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10 Cards in this Set
- Front
- Back
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One way of making transitions between vibrational levels is ... A or E
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is by direct photon absorption or emission.
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For a molecule to interact during spectroscopy (IR) it must be ... I....A
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Infrared active
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If a molecule is capable of absorbing IR radiation then it must give rise to a O...E....D...M...
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Oscillating Electric Dipole Moment
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Can homonuclear diatomics interact with IR radiation?
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No they do not have a permanent electric dipole moment
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Can heteronuclear diatomics interact with IR radiation?
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Yes, these molecules do have permanent electric dipole moments.
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Are all three normal vibrations of water IR active?
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Yes all three are
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Carbon dioxide does NOT have a permanent dipole moment does any of its bonds respond to IR radiation?
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Yes, its bending vibrations give rise to oscillating electric dipole moments. Also the asymmetric stretch is IR active.
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What is the selection rule associated with IR spectroscopy?
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Δv = ±1
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Name three advantages of IR spectroscopy...
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1) Cheap
2) Gases, Liquids and Solids 3) All polyatomic molecules have at least ONE active vibration. |
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Name two disadvantages of IR spectroscopy...
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1) Resolution is low for solids and liquids, this leads to loss in information.
2) Detailed interpretation is difficult in the fingerprint region. |
