UV Luminance Spectroscopy Why phosphorescence measurements are usually made at a low temperature? To prevent thermal degradation of the phosphorescent species To promote phosphorescence by slowing the rate of radiationless transfer processes To decease the efficiency of detector To increase the efficiency of the detector To prevent thermal degradation of the phosphorescent species To promote phosphorescence by slowing the rate of radiationless transfer processes To decease the efficiency of detector To increase the efficiency of the detector ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy Internal conversion is where None of these 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 None of these 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 ANSWER DOWNLOAD EXAMIANS APP
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 magnitude of the output signal is proportional to the power of the incident radiation None of these Because the sample won't fluoresce if the incident radiation is of low power To allow for scattering by the sample Because the magnitude of the output signal is proportional to the power of the incident radiation None of these Because the sample won't fluoresce if the incident radiation is of low power ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy Why do fluorescence spectrometers often use double-beam optics? All of these To compensate for power fluctuations in the radiation source So a reference solution can be used To compensate for beam attenuation by the monochromator All of these To compensate for power fluctuations in the radiation source So a reference solution can be used To compensate for beam attenuation by the monochromator ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy In the intersystem crossing a molecule converts excess electronic energy to vibrational energy 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 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 ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy Fluorescence occurs when None of these 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 a molecule lowers its vibrational energy by losing it's excess energy as a photon None of these 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 a molecule lowers its vibrational energy by losing it's excess energy as a photon ANSWER DOWNLOAD EXAMIANS APP
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