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- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.08%3A_Spectroscopy_Based_on_ScatteringThis page explains the scattering of light, focusing on why the sky appears blue and sunsets look red based on light's wavelength and atmospheric particles. Elastic scattering is discussed, with two t...This page explains the scattering of light, focusing on why the sky appears blue and sunsets look red based on light's wavelength and atmospheric particles. Elastic scattering is discussed, with two types: Rayleigh and large-particle scattering. Turbidimetry and nephelometry, techniques that measure scattered radiation, are compared. The choice between them depends on particle concentration and size. Applications include water clarity and cation/anion determination.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/14%3A_Applications_of_Ultraviolet_Visible_Molecular_Absorption_Spectrometry/14.02%3A_Absorbing_SpeciesThere are two general requirements for an analyte’s absorption of electromagnetic radiation. First, there must be a mechanism by which the radiation’s electric field or magnetic field can interact wit...There are two general requirements for an analyte’s absorption of electromagnetic radiation. First, there must be a mechanism by which the radiation’s electric field or magnetic field can interact with the analyte. For ultraviolet and visible radiation, absorption of a photon changes the energy of the analyte’s valence electrons. The second requirement is that the photon’s energy must exactly equal the difference in energy between two of the analyte’s quantized energy states.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.01%3A_Overview_of_SpectroscopyThis chapter explores the interaction of electromagnetic radiation with matter, particularly in the context of spectroscopy. It covers the principles of spectroscopy using ultraviolet, visible, and in...This chapter explores the interaction of electromagnetic radiation with matter, particularly in the context of spectroscopy. It covers the principles of spectroscopy using ultraviolet, visible, and infrared radiation. The chapter explains the wave and particle nature of electromagnetic radiation, highlighting its fundamental properties and explaining how matter absorbs or emits photons.
