Generation of multifrequency laser emission and its application as an excitation source in supersonic jet spectrometry

Nishida, Mitsuru.; Lin, Cheng Huang; Imasaka, Totaro

doi:10.1021/ac00070a026

Cited by 4 publications

(1 citation statement)

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“…One of the problems encountered in more broad applications of supersonic beam/multiphoton ionization/mass spectrometry to practical samples is the narrow tunable range of the dye laser. This problem can be offset, to some extent, by using a multifrequency laser emission 28 or an optical parametric oscillator, 29,30 which allows the tunable range to be extended and, hence, the characterization of numerous other types of polymers.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Photoablation Products Resulting from Polymer Materials by Supersonic Beam/Multiphoton Ionization/Time-of-Flight Mass Spectrometry

1996

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Photoablation products arising from polymer materials were examined by supersonic beam spectrometry, and the results are compared with those obtained by thermal decomposition. The high selectivity provided by supersonic beam spectrometry allows detection of minor species, e.g., styrene occurred from poly(α-methylstyrene) by cleavage of a methyl group and by proton rearrangement. Because ablation techniques involve high temperatures, thermally stable materials such as poly(p-methylstyrene) can be examined. The latter material is difficult to examine by thermal decomposition, even at 350 °C. It is also possible to differentiate between isomer ablation products, e.g., α-methylstyrene and p-methylstyrene. The instrumental setup described herein was used to examine several authentic samples, such as ABS resin (acrylonitrile-butadiene-styrene) and O-ring (SBR, styrene-butadiene rubber), as well as polystyrene foam. As a result, a styrene segment could be confirmed to be present in these materials. However, no evidence was found for its presence in a glue sample that was suspected to contain styrene on the basis of conventional mass spectrometry. The latter finding confirms the high degree of selectivity of the technique.

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Section: Discussionmentioning

confidence: 99%