David H. Devonald III Marvin C. Goldberg 1973 <p>A relationship is established between fluorescent spectra&nbsp;obtained by using a light path through the liquid solution and the&nbsp;fluorescent spectra obtained by a direct reading of surface reflection&nbsp;(remote sensing). A brief review of quantum fundamentals provides the&nbsp;necessary information to conclude that "see-through" and reflectance&nbsp;spectra are identical in wavelength response. Many floating films&nbsp;contain fluorescent materials; thus fluorescent spectroscopic techniques&nbsp;were used to obtain the fluorescent spectra of lube oil, crude oil, and<br />lignosulfonie acid in an effort to detect, identify, and quantify these&nbsp;representative fluorescent materials in water solutions. For each&nbsp;material tested the emission maximum was established. The emission&nbsp;maximum was then held constant while the absorption spectrum was&nbsp;recorded and the absorption maximum established. The complete&nbsp;spectral curves are presented.</p> application/pdf en U.S. Geological Survey Fluorescent spectroscopy, a technique for characterizing surface films article