Two, three and four photon absorption of naphthalene

J.C. Poveda, A. Guerrero. , I. Álvarez, C. Cisneros


The effects of the multiple-photon absorption on the ionization, MPI, and
dissociation, MPD, of Naphthalene were investigated. Laser radiation of 266
nm at pulse widths of 4.5 ns and intensities of the order of
10$^{8}$-10$^{10}$ W$\cdot $cm$^{ - 2}$, and carrier gases, CGs, such as helium,
neon, argon, krypton, and xenon were used. In order to identify the produced
ions, the time of flight mass spectrometry technique, ToF-MS, was employed.
From the experimental data the number of photons absorbed was calculated,
being two at low energies per pulse, less than 1.0 mJ, where the parent ion,
C$_{10}$H$_{8}^{ + }$, was detected, in agreement with the ionization
energy of Naphthalene, 8.14 eV. Increasing the energy per pulse to more
than 1.0 mJ, new ions were observed, and three and four photons processes
were identified. The effect of the CG was also investigated: the ion yields
change as a function of energy per pulse and the CG. A sequence of pathways
for photoionization and photodissociation was proposed taking into account
the energy per pulse, number of absorbed photons and normalized ion


Naphthalene; PAHs; MPI; MPD; ToF-MS

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Revista Mexicana de Física

ISSN: 2683-2224 (on line), 0035-001X (print)

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