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

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UV Luminance Spectroscopy
Internal conversion is where

A molecule converts its excess energy to light, and emits a photon
A molecule converts excess electronic energy to vibrational energy
None of these
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 promote phosphorescence by slowing the rate of radiationless transfer processes
To increase the efficiency of the detector
To prevent thermal degradation of the phosphorescent species
To decease the efficiency of detector

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

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

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