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The laser pulse width was measured on-site the mass spectrometer by scanning a dispersion in the pulse compressor. A pulse width of 49 fs measured was close to 35 fs calculated from the spectrum.
Dioxins contained in the soil was measured by means of multiphoton ionization mass spectrometry using a femtosecond laser. By a combination with gas chromatography, congeners of dioxins were determined at femtogram levels.
Tetraazacrown was useful for measuring a >1.6-fs pulse in the ultraviolet region and aliphatic hydrocarbon for a >0.96-fs pulse in the far-ultraviolet region using an autocorrelator consisting of a mass spectrometer as a two-photon-response detector.
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