UV Luminance Spectroscopy
In the intersystem crossing

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
a molecule converts its excess energy to light, and emits a photon

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UV Luminance Spectroscopy
Internal conversion is where

A molecule converts excess electronic energy to vibrational energy
the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa)
None of these
A molecule converts its excess energy to light, and emits a photon

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UV Luminance Spectroscopy
Fluorescence occurs when

None of these
a molecule lowers its vibrational energy by losing it's excess energy as a photon
a molecule returns to the electronic ground state from an excited singlet state by losing it's excess energy as a photon
a molecule returns to the electronic ground state from an excited triplet state by losing it's excess energy as a photon

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

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

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