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... For the system presented in this paper, the Lorentzian model would be valid for frequencies greater than ∼ 200 kHz, given by the frequency noise amplitude of the ECDL. However, Sν ( f ) is dominated by other sources of noise up to ∼ 1 MHz. As a result, the Lorentzian contribution to Sν ( f ) is take ...
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Ultraviolet–visible spectroscopy



Ultraviolet–visible spectroscopy or ultraviolet-visible spectrophotometry (UV-Vis or UV/Vis) refers to absorption spectroscopy or reflectance spectroscopy in the ultraviolet-visible spectral region. This means it uses light in the visible and adjacent (near-UV and near-infrared [NIR]) ranges. The absorption or reflectance in the visible range directly affects the perceived color of the chemicals involved. In this region of the electromagnetic spectrum, molecules undergo electronic transitions. This technique is complementary to fluorescence spectroscopy, in that fluorescence deals with transitions from the excited state to the ground state, while absorption measures transitions from the ground state to the excited state.
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