N. Yoshida et al., Development of tunable picosecond dye laser for multiphoton ionization of dioxin precursors in supersonic jet/time-of-flight mass spectrometry, ANALYT CHEM, 73(18), 2001, pp. 4417-4421
A distributed-feedback dye laser has been developed for achieving the effic
ient multiphoton ionization of chlorobenzene and dichlorobenzene, that is,
precursor molecules of dioxins. This tunable picosecond laser with a narrow
spectral line width, that is, a nearly transform-limited pulse, provides a
more efficient ionization than the nanosecond laser, which is currently in
use in supersonic jet spectrometry. The advantage of picosecond over nanos
econd and femtosecond lasers is also discussed on the basis of the theoreti
cal model reported in a previous paper.