UV Luminance Spectroscopy
In the intersystem crossing

a molecule converts its excess energy to light, and emits a photon
the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)
All of these
a molecule converts excess electronic energy to vibrational energy

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UV Luminance Spectroscopy
Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy?

Because the sample won't fluoresce if the incident radiation is of low power
To allow for scattering by the sample
None of these
Because the magnitude of the output signal is proportional to the power of the incident radiation

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UV Luminance Spectroscopy
For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule?

Because a change in dipole moment lowers the energy required for electronic transitions
Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching
All of these
Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment

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