UV Luminance Spectroscopy For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule? All of these Because a change in dipole moment lowers the energy required for electronic transitions Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment All of these Because a change in dipole moment lowers the energy required for electronic transitions Because fluctuations in the dipole moment allow the molecule to deform by bending and stretching Because for absorption to occur, the radiation must interact with the electric field caused by changing dipole moment 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 All of these 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 a molecule converts its excess energy to light, and emits a photon All of these the spin of an excited electron reverses, changing the state of the molecule (from singlet state to triplet state or vice versa) ANSWER DOWNLOAD EXAMIANS APP
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 decease the efficiency of detector To prevent thermal degradation of the phosphorescent species To increase the efficiency of the detector To promote phosphorescence by slowing the rate of radiationless transfer processes To decease the efficiency of detector To prevent thermal degradation of the phosphorescent species To increase the efficiency of the detector ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy Why must the radiation source for fluorescence spectrometry be more powerful than for absorption spectroscopy? Because the magnitude of the output signal is proportional to the power of the incident radiation None of these To allow for scattering by the sample 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 None of these To allow for scattering by the sample 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? To compensate for beam attenuation by the monochromator All of these So a reference solution can be used To compensate for power fluctuations in the radiation source To compensate for beam attenuation by the monochromator All of these So a reference solution can be used To compensate for power fluctuations in the radiation source ANSWER DOWNLOAD EXAMIANS APP
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) 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) A molecule converts its excess energy to light, and emits a photon A molecule converts excess electronic energy to vibrational energy None of these ANSWER DOWNLOAD EXAMIANS APP
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