Chemical ionization in Fourier transform mass spectrometry

Error estimates for finite zero-filling in Fourier transform spectrometry

Preliminary work on the application of this procedure is described. A 1 : 1 glycerol : water system containing the sample is cooled to < 4.2/sup 0/K in a double nested helium Dewar which contains quartz optical windows. A control 553 Ar-ion laser is used for uv production. Spatial separation of the laser lines is achieved with external prisms, and detection electronics include a photon counting system as well as conventional analog equipment. A comparison of the line-narrowed fluorescence spectrum of pyrene in a 1 : 1 glycerol-ethanol glass at 4.2/sup 0/K with that of pyrene in biphenyl and in fluorene at ca. 10/sup 0/K is made. Representative spectra of anthracene (1.2 ppM), pyrene (224 ppB), and a mixture (100 ppB of each), in 1 : 1 glycerol: water at 4.2/sup 0/K are displayed. The authors expect to implement this method as a practical analytical tool for the analysis of polynuclear aromatic hydrocarbons at very low concentrations in contaminated water samples.

G. Horlick

Papers

Fourier domain interpolation of sampled spectral signals