UV Luminance Spectroscopy
What is the relationship between wavelength and wave number?

Wavelength in nanometers x wavenumber = 1
Wavenumber - wavelength in nanometers = 1
None of these
Wavenumber = 1 / wavelength in centimeters

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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 prevent thermal degradation of the phosphorescent species
To increase the efficiency of the detector
To decease the efficiency of detector

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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)
a molecule converts excess electronic energy to vibrational energy
All of these

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UV Luminance Spectroscopy
Internal conversion is where

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 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
Fluorescence occurs when

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

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