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Resonant ionization of oxygen and hydrogen atoms following laser-induced photodissociation of nitrobenzene vapour

1993; IOP Publishing; Volume: 26; Issue: 19 Linguagem: Inglês

10.1088/0953-4075/26/19/006

1361-6455

Alasdair W. Clark, C. Kosmidis, K. W. D. Ledingham, A. Marshall, Joseph Sander, R. P. Singhal, M. Campbell,

Spectroscopy and Laser Applications

The resonant ionization of oxygen and hydrogen atoms has been observed in a linear time-of-flight (TDF) mass spectrometer during studies of the resonance enhanced multiphoton ionization (REMPI) of nitrobenzene vapour in the wavelength region 225-245 nm. Oxygen ions have been observed in the mass spectrum in the region of 226 nm. and have been identified as arising from the 2p4 3 P to 2p33p 3P two-photon transition in atomic oxygen. A large enhancement in the hydrogen ion yield from nitrobenzene was also recorded when the laser wavelength was tuned through the 1s 2S to 2s 2S two-photon transition of atomic hydrogen at 243.13 nm. The large on-resonance enhancements in both signals indicate that oxygen and hydrogen atoms are produced in abundance during the interaction between ultraviolet laser light and nitrobenzene vapour.