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CHEM 361 - Chapter 13_ Spectroscopy
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CHEM 361 - Chapter 13_ Spectroscopy
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CHEM 361 - Chapter 13: SpectroscopySpectroscopy - correct answer-Study of molecules by observing their interaction with
electromagnetic radiation emitted, absorbed, or scattered by atoms and molecules
What does a spectrometer consist of? - correct answer-1) Source of radiant
2) Dispersing element
3) Detector
What is an example of a dispersing element? - correct answer-An interferometer
What does the detector record? - correct answer-Transmitted light
When does absorption take place? - correct answer-When a dipole in a molecule interacts
with the incident electromagnetic wave
When does the speed of the electromagnetic wave change? - correct answer-When it
passes through a different medium
How does the frequency remain the same? - correct answer-Wavelength changes to
counteract c (speed) changing
What does the absorption of light induce? - correct answer-Transition to the excited state
What orbitals do electrons occupy in the ground state (lowest energy level)? - correct
answer-Bonding orbitals
Where is kinetic energy stored? - correct answer-In the vibrations of chemical bonds, so
more kinetic energy stored = more vibrations
Why is light only absorbed at specific wavelengths? - correct answer-The energy difference
between the ground state and the excited state must match the energy of the incident of light
for absorption to occur
What is an absorption spectrum determined by? - correct answer-1) Energy of electron
transitions
2) Vibrational fine structure
3) Rotational fine structure
What is intensity of transitions determined by? - correct answer-Selection rules
Selection Rules - correct answer-A statement about whether a transition is allowed or not
allowed
What is the intensity proportional to? - correct answer-The square of the transition dipole
moment
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