Physics
Spectral Line Shape
Quick fact
A single spectral line can reveal whether an atom is moving toward or away from us, and even its temperature!
Why this is interesting
Have you ever wondered how scientists determine the composition of a star? The answer lies in something as simple as the shape of light.
Read the full explanation
Understanding Spectral Line Shape
Spectral lines are created when atoms absorb or emit specific wavelengths of light. The shape of these lines tells us about the energy levels of the atom, and how it moves through space. When a star is hot, its spectral lines change shape, giving clues about its composition and motion.
A deeper explanation
The shape of a spectral line is determined by several factors: the energy transitions between atomic states, temperature effects that broaden the line, and motion that shifts its position. Line shapes are essential for analyzing the physical properties of stars, gases, and even molecules in space.