Abstract

Detection limits for absorption, luminescence, photoionization, Raman, and photothermal molecular spectrometric methods are calculated from signal-to-noise expressions. The detection limits (in m⁻³) represent the best possible values by the various methods, since the limiting noises in each case were chosen. Molecular luminescence methods, with laser excitation, approach 1 species/cm³. Methods relying upon two (or more) laser wavelengths generally have much poorer detection limits than the simpler single-wavelength methods.

Applications of ionization-detected stimulated Raman spectroscopy in molecular-beam studies

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