Abstract
A laser photoionization time-of-flight mass-spectrometer has been developed and used to investigate the photoionization and photofragmentation of benzene and benzaldehyde molecules by an excimer KrF laser radiation at the wavelength of 249 nm in the intensity range from 5·104 to 5·109 W/cm2. It has been found that at low laser intensity ions formed by two-step photoionization are most abundant in mass spectra. By increasing laser intensity an extensive fragmentation of molecules, up to C+ ions, was observed. The maximum ionization yield of benzaldehyde comes to 0.1% of the number of molecules in the photoionization volume and, according to calculations, to 10% for benzene molecules, when the radiation intensity is 5·109 W/cm2.
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Antonov, V.S., Letokhov, V.S. & Shibanov, A.N. Photoionization mass-spectrometry of benzene and benzaldehyde molecules with an excimer KrF laser. Appl. Phys. 22, 293–297 (1980). https://doi.org/10.1007/BF00899880
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DOI: https://doi.org/10.1007/BF00899880