Report

External heavy atom effect on detection limits and lifetimes of phosphorescence in time resolved laser excited phosphorimetry

“…There seems to be fairly good agreement that the charge-transfer mechanism (i) and exchange mechanism (ii) are the most important. Some investigators (6,(10)(11)(12) favor a charge-transfer mechanism while others support the exchange mechanism (13)(14)(15)(16)(17)(18)(19). There is excellent evidence in favor of the charge-transfer mechanism in the case of planar aromatic molecules perturbed by heavy atom-containing aromatics such as tetrabromobenzene (10,11).…”

“…The theory of laser operation is given in many texts (16-18). Allkins (19) and Steinfeld to molecular fluorescence spectrometry (23)(24)(25), photoacoustic spectrometry (26), Raman spectrometry, (27), and Coherent anti-Stokes Raman Spectrometry, CARS (28). Fixed frequency lasers, such as nitrogen laser (29), the He-Cd laser (30), and the argon ion laser (31), have also been utilized in molecular fluorescence spectrometry.…”

Trace detection in gases using photoacoustic spectroscopy and Fabry-perot interferometry

“…For example, the study of hyperflne splittings has been achieved by using interferometers (203)(204)(205)(206)(207). Another frec^jent application Is in the area of establishing high-frequency stability in lasers (208,209) for high resolution spectroscopic nwasurements. Finally, determination of laser wavelengths to great precision and accuracy has also been accomplished with the aid of interfermetry (210,211).…”