electromagnetic spectroscopy

These techniques are known respectively as "mass spectrometry" and "electromagnetic spectroscopy".

Electromagnetic spectroscopy is the branch of physics that studies matter by its emitted or reflected spectra.

LD measurements are based on the interaction between matter and light and thus are a form of electromagnetic spectroscopy.

In the 1860s Lockyer became fascinated by electromagnetic spectroscopy as an analytical tool for determining the composition of heavenly bodies.

Fluorescence spectroscopy aka fluorometry or spectrofluorometry, is a type of electromagnetic spectroscopy which analyzes fluorescence from a sample.

It is more specific than the general term electromagnetic spectroscopy in that spectrophotometry deals with visible light, near-ultraviolet, and near-infrared, but does not cover time-resolved spectroscopic techniques.