# Spectrum analysis

Free to read here, from Project Gutenberg.

3 titles; page 1 of 1.

- [The Theory of Spectra and Atomic Constitution: Three Essays](https://invisiblenetwork.ai/books/gutenberg/47464) by Niels Bohr
- [On the effect of electric and magnetic fields on spectral lines](https://invisiblenetwork.ai/books/gutenberg/73082) by Niels Bohr
- [On the Quantum Theory of Line-Spectra, Part 1 and 2](https://invisiblenetwork.ai/books/gutenberg/47167) by Niels Bohr