Dissociation-ionization and ionization-dissociation by multiphoton absorption of acetaldehyde at 266 and 355 nm: dissociation pathways

J.C. Poveda ^[1] ; I. Álvarez ^[2] ; A. Guerrero-Tapia ^[2] ; C. Cisneros ^[2]
1. [1] Universidad Industrial de Santander
  
  Universidad Industrial de Santander
  
  Colombia
2. [2] Instituto de Ciencias Físicas-Universidad Nacional Autónoma de México, Cuernavaca-Morelos.
Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 62, Nº. 3, 2016, págs. 206-212
Idioma: inglés
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Resumen
- The experimental results from the interaction of a sample of acetaldehyde (CH3 CHO) with laser radiation at intensities between 109 and 1011 Wcm−2 and wavelengths of 266 and 355 nm are reported. As a result of multiple photon absorption, cations from ionization-dissociation (I-D) or dissociation-ionization (D-I) processes, were detected using a reflectron time of flight mass spectrometer. The processes I-D is predominant at 355 nm and D-I is predominant at 266 nm. The formation of different ions is discussed. From analysis of the ratios between the ion currents [I(CH3CO+)+I(CO+)]/[ I(CH+3)+I(HCO+)], originated from the C-C bond or from the C-H bond breaking at different laser intensities, the predominant channels are determined.