# spectroscopy

/spɛkˈtɹɑskəpi/ (US) · /spɛktɹˈɒskəpi/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/spectroscopy
Updated: 2026-05-06

## Definition

a scientific method that uses light to study what things are made of. By looking at how light bounces off or passes through an object, scientists can identify its chemicals.

For teachers: the study of the interaction between matter and electromagnetic radiation as a function of wavelength or frequency. Used to determine the chemical composition, physical structure, and electronic properties of a substance.

## Examples

- Scientists use spectroscopy to find water on other planets.
- By using infrared spectroscopy, the lab technicians were able to identify the unknown powder found at the crime scene.
- Astronomical spectroscopy allows researchers to determine the chemical composition and temperature of distant stars by analyzing the specific absorption lines present in their light spectra.

## Usage notes

- Uncountable in its general sense; specific techniques (e.g., Raman spectroscopy) are often referred to by name.

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