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A multiphoton ionization study of acetone using time-of-flight mass spectrometry

Chinese Science Bulletin, ISSN: 1001-6538, Vol: 55, Issue: 27-28, Page: 3123-3130
2010
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The 3p Rydberg states of acetone and photodissociation of the acetone cation were studied using time-of-flight (TOF) mass spectrometry. The 3p Rydberg state spectroscopy of acetone was investigated with linearly polarized two-photon resonance enhanced multiphoton ionization (REMPI) from 320 to 337 nm. Several new transition bands were observed in the spectra. In addition to the CHCOCH ion, CHCO and CH fragments were observed. The laser power dependences suggest that the CHCOCH, CHCO and CH ions are produced in three-, four-, and four-photon processes, respectively. Production of CHCO and CHinvolves excitation of the ground state acetone cation by an additional photon and subsequent decomposition of the excited acetone ion. The average translational energies of CHCO and CH from dissociation in CHCOCH(X) + hv → CHCO + CH and CHCOCH(X) + hv → CH + CHCO, respectively, were derived from the ion TOF peak profiles. © 2010 Science China Press and Springer-Verlag Berlin Heidelberg.

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