UV Luminance Spectroscopy Internal conversion is where A molecule converts excess electronic energy to vibrational energy A molecule converts its excess energy to light, and emits a photon 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 excess electronic energy to vibrational energy A molecule converts its excess energy to light, and emits a photon 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) ANSWER DOWNLOAD EXAMIANS APP
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) 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 ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy What is the relationship between wavelength and wave number? Wavenumber - wavelength in nanometers = 1 Wavenumber = 1 / wavelength in centimeters Wavelength in nanometers x wavenumber = 1 None of these Wavenumber - wavelength in nanometers = 1 Wavenumber = 1 / wavelength in centimeters Wavelength in nanometers x wavenumber = 1 None of these ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy For a molecule to absorb IR, why must the molecule's vibrations cause fluctuations in the dipole moment of the molecule? 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 Because a change in dipole moment lowers the energy required for electronic transitions All of these 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 Because a change in dipole moment lowers the energy required for electronic transitions All of these 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 Because the sample won't fluoresce if the incident radiation is of low power None of these To allow for scattering by the sample Because the magnitude of the output signal is proportional to the power of the incident radiation Because the sample won't fluoresce if the incident radiation is of low power None of these To allow for scattering by the sample ANSWER DOWNLOAD EXAMIANS APP
UV Luminance Spectroscopy Why do fluorescence spectrometers often use double-beam optics? To compensate for beam attenuation by the monochromator To compensate for power fluctuations in the radiation source All of these So a reference solution can be used To compensate for beam attenuation by the monochromator To compensate for power fluctuations in the radiation source All of these So a reference solution can be used ANSWER DOWNLOAD EXAMIANS APP
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