DURING 1932, work has been carried on in this laboratory on the measurement of the relative intensity of spectral lines in the above elements. The amount of material available was very limited ...

The Chi-squared goodness of fit statistical method, which compares either concentrations or spectra lines directly, is used to match an unknown spectrum to possible library candidates. The matching ...

Studying the line spectra produced by hot gases and absorbed by cooler gases allows us to identify the elements in stars. When a gas is very hot, it doesn’t emit all wavelengths of light.

This causes an absorption spectra, as shown below. Because the energy levels are the same, the lines in the emission spectra of an element are in the same position as the lines in the absorption ...