Table of Contents
Why does each element have a unique spectrum of absorption or emission lines?
Each elements emission spectrum is distinct because each element has a different set of electron energy levels. The emission lines correspond to the differences between various pairs of the many energy levels. The lines (photons) are emitted as electrons fall from higher energy orbitals to lower energies.
Which spectral lines may appear in both emission and absorption spectrum of hydrogen?
Line Spectrum of Hydrogen
| Series | n1 | Spectral Region |
|---|---|---|
| Lyman | 1 | Ultraviolet |
| Balmer | 2 | Visible |
| Paschen | 3 | Infrared |
| Brackett | 4 | Infrared |
What do the spectral lines show for each element?
From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.
Why the spectral lines of each element are unique?
Absorption lines are seen when electrons absorb photons and move to higher energy levels. Since each atom has its own characteristic set of energy levels, each is associated with a unique pattern of spectral lines.
Does each element have a unique emission spectrum?
There are many possible electron transitions for each atom, and each transition has a specific energy difference. This collection of different transitions, leading to different radiated wavelengths, make up an emission spectrum. Each element’s emission spectrum is unique.
How are emission lines and absorption lines formed?
Emission and absorption lines are also seen when oppositely charged ions recombine to an electrically neutral state. The thus formed neutral atom is highly excited, with electrons transitioning between states, emitting and absorbing photons. The resulting emission and absorp-tion lines are called recombination lines.
What is the difference between emission and absorption in terms of what happens to an electron in an atom?
Emission is when electrons return to energy levels. Absorption is when electrons gain energy and jump to higher energy levels. Absorption and emission of light reveals details about the atomic structure of an atom by telling us the amount of energy levels and the space between the energy levels.