What is the difference between IR and UV/vis spectroscopies?
IR spectroscopy is largely qualitative, whereas UV-vis spectroscopy can be (highly) quantitative.
A much more quantitative method is UV-vis spectroscopy, which permits the use of aqueous solutions at very low concentrations (water absorbs in the IR spectrum far too strongly to be used as a solvent!). The Beer-Lambert law (sometimes!) allows quantitative determination of some analyte.
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Infrared (IR) spectroscopy measures the absorption of infrared radiation by molecules, providing information about molecular vibrations and functional groups. UV/visible (UV/vis) spectroscopy measures the absorption of ultraviolet and visible light by molecules, providing information about electronic transitions and chromophores. While both techniques involve the absorption of electromagnetic radiation, they differ in the energy range of radiation used and the type of molecular information obtained.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- How is infrared spectroscopy useful to a chemist?
- How does mass spectroscopy work?
- Do halogens appear in the IR spectrum? For example, in a molecule bromine attached to a benzene, where would the bromine appear on the IR spectra?
- How can you tell the difference between an ester, ketone, carboxylic acid, aldehyde, amines, amides and phenol using infrared spectroscopy?
- How is IR spectroscopy analyzed?
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