Spectroscopy and dynamics of ionic complexes: N2+-He and N2O+-Ar

E. J. Bieske; A. M. Soliva; A. Friedmann; John P. Maier

doi:10.1117/12.143118

22 April 1993 Spectroscopy and dynamics of ionic complexes: N2+-He and N2O+-Ar

E. J. Bieske, A. M. Soliva, A. Friedmann, John P. Maier

Proceedings Volume 1858, Laser Techniques for State-Selected and State-to-State Chemistry; (1993) https://doi.org/10.1117/12.143118
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

This paper describes investigations of fundamental photophysical processes in the small inorganic ionic complexes N₂⁺-He and N₂O⁺-Ar. Studies were carried out by observing the wavelength dependent photofragment yield of mass selected ionic species in a guided ion beam apparatus. Spectra of the N₂⁺-He complex exhibit several bands in the near UV that correspond with those of the N₂⁺ chromophore. By measuring the relative intensities of the B $IMP X origin and 1₁¹ hot bands as a function of ion flight time from ion source to the laser, a vibrational predissociation lifetime of 220 +/- 30 microsecond(s) has been determined for the (v equals 1) state of the N₂⁺-He complex. For the N₂O⁺-Ar complex, vibrationally structured electronic bands were observed which arise from charge transfer type transitions. In the ground state of the complex the charge is localized principally on N₂O. Lying above this ground state by the difference in the N₂O and Ar ionization potentials are several excited states where the charge is localized on Ar. Photodissociation to produce both N₂O⁺ and Ar⁺ fragments occurs. While the former fragment probably arises via vibrational predissociation from vibrationally excited levels in the ground state, the appearance of Ar⁺ fragments is evidence for rapid vibrational predissociation on the excited state surface. Dissociation energies (D₀ values) of 690 cm^-1 for the X state of the N₂O⁺-Ar complex and 1340 cm^-1 for the lowest charge transfer state dissociation energy were inferred from the appearance thresholds for N₂O⁺ and Ar⁺ fragments. Various possible dissociation routes are discussed.

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E. J. Bieske, A. M. Soliva, A. Friedmann, and John P. Maier "Spectroscopy and dynamics of ionic complexes: N2+-He and N2O+-Ar", Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); https://doi.org/10.1117/12.143118

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KEYWORDS

Argon

Ions

NOx

Ionization

Spectroscopy

Chromophores

Luminescence

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