Most molecules can be detected through absorption measurements: if you illuminate the gas with the right color of light, some will be absorbed, and this can be detected.

The dielectrophoretic properties of cells can be monitored by light absorption measurements: positive DEP attracts the cells to the wall of the well, thus when probed with a light beam the well the light intensity increases through the well.

The synchrotron radiation, which comes up as a side effect, was first used in 1967 for absorption measurements.

Quite simply, the rules of quantum mechanics preclude direct absorption measurement.

Other applications of Xe lamp based IBBCEAS include its combination with discharge flow tubes for absorption measurements of marine boundary layer species like I, IO and OIO, and for measuring weak near-UV and visible gas phase absorption spectra.

PLE spectroscopy is a useful method to investigate the electronic level structure of materials with low absorption due to the superior signal-to-noise ratio of the method compared to absorption measurements.

No absorption measurement is made other than at 430 nm.

On August 7, 1968 this first dedicated storage ring based synchrotron radiation facility produced its first data when Ulrich Gerhardt of the University of Chicago, carried out simultaneous reflection and absorption measurements on CdS over the wavelength range 1100-2700 Å.

In absorption measurements, the smallest amount that can be detected is proportional to the length that the light travels through a sample.