High repetition rate atmospheric pressure nitrogen laser for lifetime measurements

Abstract

Consideration must be given to the instrument's portability if it is to be used for field studies utilizing a mobile laboratory. In this laboratory, Perkin-Elmer has proven reasonably portable. The Tracer is physically the smallest of the three but exhibits some operating difficulties in the best of laboratory conditions. The Varían is designed primarily as a laboratory research instrument but presumably is rugged enough to be used for field studies.Conclusions and Recommendations. It is evident from the data presented that actual experimental parameters may vary from the manufacturer's specifications as a result of laboratory conditions or differences in individual instruments. Therefore, it should be standard practice to characterize each FPD before placing any confidence in resulting data.The choice of an FPD system should be based upon careful consideration of individual laboratory needs and budgetary constraints. To select the instrument with the lowest detection limit would be unwise if the linear range does not extend to the concentration levels pertinent to a particular application. Additionally, instrumental options, such as other detectors, injection systems, and capillary accessories should be considered before purchasing.

Laser spectroscopy on organic molecules

“…A straightforward extension of this study might be the application to time-resolved fluorometry. A highly-repetitive nitrogen laser with subnanosecond pulse widths was constructed and used as a pump source for a dye laser [4], which produced nearly-transformlimited 200 ps pulses [5]. Time-resolved fluorometry is essentially useful for the suppression of impurity fluorescence, especially when the fluorescence lifetime of the sample is sufficiently long as in the case of polycyclic aromatic hydrocarbons.…”