UV Luminance Spectroscopy
Internal conversion is where

None of these
A molecule converts its excess energy to light, and emits a photon
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)

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UV Luminance Spectroscopy
Why phosphorescence measurements are usually made at a low temperature?

To increase the efficiency of the detector
To promote phosphorescence by slowing the rate of radiationless transfer processes
To prevent thermal degradation of the phosphorescent species
To decease the efficiency of detector

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UV Luminance Spectroscopy
Fluorescence occurs when

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
None of these
a molecule lowers its vibrational energy by losing it's excess energy as a photon

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