A

Absorption Spectrum

E = hν; A = εlc
Quick Reference
Formula / NotationE = hν; A = εlc
Also Known AsAtomic absorption spectrum; molecular absorption spectrum; dark-line spectrum; absorption spectroscopy

What is Absorption Spectrum?

An absorption spectrum is the pattern of wavelengths (or frequencies) of electromagnetic radiation that are absorbed by a substance as radiation passes through it. Electrons in atoms or molecules absorb photons and transition to higher energy levels, producing dark lines or bands against a continuous background spectrum.

Formula & Notation

E = hν; A = εlc

Other Names / Synonyms: Atomic absorption spectrum; molecular absorption spectrum; dark-line spectrum; absorption spectroscopy

Properties & Characteristics

Specific to each element or compound (fingerprint); measured in UV, visible, or IR regions; related to emission spectrum by complementary dark/bright lines; described by Beer–Lambert law: A = εlc

Uses & Applications

Identifying unknown compounds; quantitative analysis (spectrophotometry); studying electron transitions; astronomical identification of elements in stars; quality control in pharmaceutical industry

Safety Information

Analytical technique requiring UV or IR radiation sources — UV radiation is hazardous to eyes and skin with prolonged exposure. Always use appropriate shielding and protective eyewear.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Absorption Spectrum
Formula E = hν; A = εlc
Synonyms Atomic absorption spectrum; molecular absorption spectrum; dark-line spectrum; absorption spectroscopy

Frequently Asked Questions

An absorption spectrum is the pattern of wavelengths (or frequencies) of electromagnetic radiation that are absorbed by a substance as radiation passes through it. Electrons in atoms or molecules absorb photons and transition to higher energy levels, producing dark lines or bands against a continuous background spectrum.

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