Ammonia and eight aliphatic amines (ranging in alkyl chain length from C1 to C16) are photolyzed at 193 nm, producing fluorescent molecular fragments (NH from ammonia; CN, CH, and NH from the amines). Fluorescence from NH is used to quantify ammonia; CN fluorescence is used to quantify the amines. Limits of detection in the 10-50 pmol regime, precision of ~6% RSD, and linear dynamic ranges of 1-3 decades in, quantity of parent compound are observed. A small but discernible "large molecule effect" exists; as the size of the alkyl chain in RNH2 increases, the limit of detection increases, and the dependence of the fragment fluorescence signal on photolysis laser fluence also increases. Attempts to enhance fragment fluorescence intensities via "probe-laser" excitation of ground-state fragments were unsuccessful; it is inferred that, at the photolysis fluences employed (~2 × 1018 photons/cm2), few ground-state fragments are formed.
Jane G. Jinkins and E. L. Wehry, "Laser Photolytic Fragmentation-Fluorescence Spectrometry of Ammonia and Aliphatic Amines," Appl. Spectrosc. 43, 861-865 (1989)
References are not available for this paper.
OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.