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  1. What does an absorption spectrum look like. The diagram below shows a simple UV-visible absorption spectrum for buta-1,3-diene - a molecule we will talk more about later. Absorbance (on the vertical axis) is just a measure of the amount of light absorbed. The higher the value, the more of a particular wavelength is being absorbed.

  2. Jun 26, 2023 · Continuous Spectrum. A rainbow is an example of a continuous spectrum. Here, the colors displayed are within the visible spectrum (between 380-760 nm). Light in this wavelength range is visible to the naked eye. Unlike the visible spectrum, light that is of different wavelengths (see the electromagnetic spectrum below) is not visible.

  3. Jan 23, 2023 · The visible region of the spectrum comprises photon energies of 36 to 72 kcal/mole, and the near ultraviolet region, out to 200 nm, extends this energy range to 143 kcal/mole. Ultraviolet radiation having wavelengths less than 200 nm is difficult to handle, and is seldom used as a routine tool for structural analysis.

  4. Visible-light spectroscopy is an important tool in astronomy (as is spectroscopy at other wavelengths), where scientists use it to analyze the properties of distant objects. Chemical elements and small molecules can be detected in astronomical objects by observing emission lines and absorption lines.

  5. Jun 7, 2024 · The visible spectrum does not encompass all the colors humans perceive because the brain also perceives unsaturated colors (e.g., pink is an unsaturated form of red) and colors that are a mixture of wavelengths (e.g., magenta). Mixing colors on a palette produces tints and hues not seen as spectral colors.

    • Anne Marie Helmenstine, Ph.D.
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  6. Nov 3, 2024 · Get back to basics with this primer on the principles of spectroscopic techniques, including infrared (IR), ultraviolet-visible (UV-vis) and nuclear magnetic resonance (NMR). To make it even easier, each technique has clear explanations and descriptions supported by animations.

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  8. Jan 9, 2020 · Visible light is a range of electromagnetic radiation that can be detected by the human eye. The wavelengths associated with this range are 380 to 750 nanometers (nm) while the frequency range is approximately 430 to 750 terahertz (THz). The visible spectrum is the portion of the electromagnetic spectrum between infrared and ultraviolet.

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