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28 Cards in this Set
- Front
- Back
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spectrosopy
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study of the interaction of electromagnetic radiation with matter
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absorption
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when a molecule undergos a transition to higher-energy level
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emission
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when a molecule undergoes a transition from a higher-energy level to a lower one
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circular dichroism
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differential absorption of right-and left- circularly polarized light
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Nuclear Magnetic Resonance (NMR)
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absorption of radiofrequency eletromagnetic radiation by nuclei placd in a static magnetic field
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Rayleigh Scattering
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the direction of incident light is changed for scarttering electromagnetic radiation
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Raman Scattering
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direction of incident light is changed and there is also a change in wavelength
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refractive index
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-the ratio of the speed of light in vacuum to the speed of light in a medium
-the measure of the light scattered in the direction of the incident beam |
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Linear birefringence
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difference in refractive index for light polarized in planes perpendicular to each other
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circular direfringence
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difference in refractive index for right- and left- circularly polarized light
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optical rotation
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-directly proportional to the circular birefringence
-is the rotation of linearly polarized light |
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wavenumber
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number of wave amplitude maxima per 1-cm length along the wave
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wavelength
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distance between successive wave amplitude maxima
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absorption spectrum
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plot of the variation with wavelength or frequency of the absorption of radiation by the substance
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birefringence
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"double refraction"
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luminescence
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photon of the same or lower energy is emitted
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oscillator strength fi
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-intensity of the interacton
-thought of as characterizing the # of electrons per molecule that oscillate with the characteristic frequency vi |
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lifteie broadening
or homongeneous broadening |
-affect of lifetime on peak of NMR
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transition dipole moment
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electric dipole moment associated with the transition between the 2 states
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permanent dipole moment
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occurs whe 2 atoms have substantially different electronegatively....one atom attracts electrons from the other becoming more negative while the other becomes more positive
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dispersion anomalies
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when the refractive index of a substance undergoes large changes in the same spectral region
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infrared spectroscopy (IR)
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-probes vibrational states
-deals with the infrared region of the electromagnetic spectrum (light with a longer wavelength and lower freq. than visible light) |
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photochemistry
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study of the interaction between light and atoms or molecules
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phosphorescence
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-form of emission
-luminescence that is caused by the absorption of radiations (as light or electrons) and continues for a noticeable time after these radiations have stopped |
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fluorescence
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-form of emission
-luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a different wavelength and that ceases almost at once when the incidental radiation stops |
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visible spectroscopy
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monitor changes between electronic states
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ultraviolent spectroscopy
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monitor changes between electronic states
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dynamics
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???
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