Resonance-enhanced multiphoton ionization of the titanium atoms has been investigated in the 293321 nm wavelength. We couple a laser-ablated metal target into a molecular beam to produce free atoms. Ions produced from photoionization of the neutral atoms are monitored by a home-built time-of-flight mass spectrometer. Photoionization cross sections of the excited states of Ti I were deduced from the dependence of the ion signal intensity on the laser intensity for photon energies close to the ionization threshold. The values obtained range from 0.2 Mb to 6.0 Mb. No significant isotope-dependence was found from measurements of the photoionization cross sections of 46Ti, 47Ti, and 48Ti.
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 CH 3 COCH 3 + ion, CH 3 CO + and CH 3 + fragments were observed. The laser power dependences suggest that the CH 3 COCH 3 + , CH 3 CO + and CH 3 + ions are produced in three-, four-, and four-photon processes, respectively. Production of CH 3 CO + and CH 3 + involves excitation of the ground state acetone cation by an additional photon and subsequent decomposition of the excited acetone ion. The average translational energies of CH 3 CO + and CH 3 + from dissociation in CH 3 COCH 3 + (X) + hv → CH 3 CO + + CH 3 and CH 3 COCH 3 + (X) + hv → CH 3 + + CH 3 CO, respectively, were derived from the ion TOF peak profiles. acetone, REMPI, photodissociationCitation: Zheng X F, Wu H X, Song Y, et al. A multiphoton ionization study of acetone using time-of-flight mass spectrometry.
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