Multiphoton ionization and dissociation of naphthalene at 266, 355, and 532 nm

作者：Poveda J C^*; Guerrero A; Alvarez I; Cisneros C

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2010, 215(2-3): 140-146.

DOI：10.1016/j.jphotochem.2010.07.031

• Naphthalene
• PAHs
• Photoionization
• Photodissociation
• Time-of-flight mass spectrometry

A comparison of laser-induced multiphoton ionization/dissociation and dissociation/ionization pathways of naphthalene. C(10)H(8), is presented at 266, 355, 532 nm, using time-of-flight mass spectrometry, TOF-MS From the spectra several processes were identified: molecular ionization, simple dissociation, hydrogen transposition, hydrogen loss, and total deprotonation The dependence on the wavelength and the radiation intensity is clear. At 266 nm energies per pulse, <1 0 mj (9 23 x 10(2) MW cm(-2)). C(10)H(8)(+) dominates the spectra and new ions were observed as the laser intensity was increased At 355 nm, hydrogen loss was the principal dissociative route, with the formation of low mass ions. CH(n)(+), 0 < n < 6. in particular CH(6) was identified by isotopic analysis At 532 nm. the C(n)H(m)(+) ions, 2 < n < 5, wer

• 出版日期2010-9-25