Search
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.09%3A_ProblemsThe document appears to be focused on various analytical chemistry problems involving spectrophotometry, colorimetry, and molecular absorption techniques in different contexts such as determining conc...The document appears to be focused on various analytical chemistry problems involving spectrophotometry, colorimetry, and molecular absorption techniques in different contexts such as determining concentrations of elements or compounds in different scenarios like solutions, beverages, and solid matrices. The problems cover applications of Beer???s Law, stoichiometry of complex formation, and effects of instrumental limitations.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/13%3A_Introduction_to_Ultraviolet_Visible_Absorption_Spectrometry
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/11%3A_Spectroscopic_Methods/11.02%3A_Spectroscopy_Based_on_AbsorptionIn absorption spectroscopy a beam of electromagnetic radiation passes through a sample. Much of the radiation passes through the sample without a loss in intensity. At selected wavelengths, however, t...In absorption spectroscopy a beam of electromagnetic radiation passes through a sample. Much of the radiation passes through the sample without a loss in intensity. At selected wavelengths, however, the radiation’s intensity is attenuated. This process of attenuation is called absorption.
- https://chem.libretexts.org/Courses/Northern_Alberta_Institute_of_Technology/CHEM1130_Principles_in_Chemistry_I/4%3A_Chemical_Calculations/4.8%3A_UV/4.8%3A_UV%2F%2FVis_and_IR_SpectroscopyThe 1930s and 1940s saw the introduction of photoelectric transducers for ultraviolet and visible radiation, and thermocouples for infrared radiation. As a result, modern instrumentation for absorptio...The 1930s and 1940s saw the introduction of photoelectric transducers for ultraviolet and visible radiation, and thermocouples for infrared radiation. As a result, modern instrumentation for absorption spectroscopy became routinely available in the 1940s—progress has been rapid ever since. Frequently an analyst must select—from among several instruments of different design—the one instrument best suited for a particular analysis. In this section we examine several different instruments for mole
- https://chem.libretexts.org/Courses/University_of_California_Davis/Chem_205%3A_Symmetry_Spectroscopy_and_Structure/01%3A_Basics_of_Spectroscopy/1.05%3A_Multicomponent_SamplesThe absorbance @ λo will be constant irrespective of the condition of the sample (in equilibrium or out of equilibrium) assuming constant sum of populations. An isosbestic point is the wavelength...The absorbance @ λo will be constant irrespective of the condition of the sample (in equilibrium or out of equilibrium) assuming constant sum of populations. An isosbestic point is the wavelength in which the absorbance of two or more species are the same. The appearance of an isosbestic point in a reaction demonstrates that an intermediate is NOT required to form a product from a reactant.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/13%3A_Introduction_to_Ultraviolet_Visible_Absorption_Spectrometry/13.03%3A_Effect_of_Noise_on_Transmittance_and_Absorbance_MeasurementsIn absorption spectroscopy, precision is limited by indeterminate errors—primarily instrumental noise—which are introduced when we measure absorbance. Precision generally is worse for low absorbances ...In absorption spectroscopy, precision is limited by indeterminate errors—primarily instrumental noise—which are introduced when we measure absorbance. Precision generally is worse for low absorbances and for high absorbances . We might expect, therefore, that precision will vary with transmittance.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.11%3A_Chapter_Summary_and_Key_TermsThe chapter covers spectrophotometric techniques based on the absorption, emission, or scattering of electromagnetic radiation. It explains how molecules and atoms absorb radiation, causing changes in...The chapter covers spectrophotometric techniques based on the absorption, emission, or scattering of electromagnetic radiation. It explains how molecules and atoms absorb radiation, causing changes in energy states, and measures such as Beer???s law are used to relate absorbance to concentration. The chapter describes atomic absorption and emission methods, as well as scattering techniques like turbidimetry and nephelometry. Key terms related to spectroscopy methods and processes are included.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.02%3A_Spectroscopy_Based_on_AbsorptionThe page explains the principles and applications of absorption spectroscopy. It describes how electromagnetic radiation passes through a sample, and selective absorption at certain wavelengths leads ...The page explains the principles and applications of absorption spectroscopy. It describes how electromagnetic radiation passes through a sample, and selective absorption at certain wavelengths leads to attenuation, essential for identifying various molecular and atomic transitions. The page covers the requirements for an analyte's absorption, mechanisms involved, differences in infrared and UV/Vis spectra, and factors influencing spectral characteristics.
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Analytical_Chemistry_2.1_(Harvey)/10%3A_Spectroscopic_Methods/10.03%3A_UV_Vis_and_IR_SpectroscopyThe page discusses the evolution of color matching in spectroscopy, detailing the transition from Nessler's original method to modern photoelectric and infrared methods in the 1930s and 1940s. It then...The page discusses the evolution of color matching in spectroscopy, detailing the transition from Nessler's original method to modern photoelectric and infrared methods in the 1930s and 1940s. It then describes different instrument designs for molecular absorption spectroscopy, including filter photometers, single-beam and double-beam spectrophotometers, and diode array spectrometers, highlighting their features and limitations.
- https://chem.libretexts.org/Courses/Los_Angeles_Trade_Technical_College/Analytical_Chemistry/2%3A_Analytical_Chemistry_2.0_(Harvey)/11%3A_Spectroscopic_Methods/11.03%3A_UV/11.03%3A_UV%2F%2FVis_and_IR_SpectroscopyThe 1930s and 1940s saw the introduction of photoelectric transducers for ultraviolet and visible radiation, and thermocouples for infrared radiation. As a result, modern instrumentation for absorptio...The 1930s and 1940s saw the introduction of photoelectric transducers for ultraviolet and visible radiation, and thermocouples for infrared radiation. As a result, modern instrumentation for absorption spectroscopy became routinely available in the 1940s—progress has been rapid ever since. Frequently an analyst must select—from among several instruments of different design—the one instrument best suited for a particular analysis. In this section we examine several different instruments for mole
- https://chem.libretexts.org/Bookshelves/Analytical_Chemistry/Instrumental_Analysis_(LibreTexts)/16%3A_An_Introduction_to_Infrared_Spectrometry/16.01%3A_Theory_of_Infrared_Absorption_SpectrometryTo absorb an infrared photon, the absorbing species must experience a change in its dipole moment, which allows the oscillation in the photon's electrical field to interact with an oscillation in char...To absorb an infrared photon, the absorbing species must experience a change in its dipole moment, which allows the oscillation in the photon's electrical field to interact with an oscillation in charge within the absorbing species. If the two oscillations have the same frequency, then absorption is possible. In this section we consider classical and quantum mechanical models for vibrational spectrscopy.
