Photofragment spectroscopy of O3+

Abstract

Photofragment kinetic energy distributions have been measured for 0+ fragments from the photodissociation of ot over the wavelength range from 4579 to 7525 A, using a fast ion beam photofragment spectrometer. Three vibrationallevels of the ground state of ot are observed, and vibrational spacings determined. The partition of energy into rotation and translation of the product O 2 molecule is measured for transitions from each of these three vibrational levels. Partition of energy into vibration of the O 2 photofragement is also observed. The polarization of the transition leading to dissociation is determined to be more nearly parallel than perpendicular. The results are interpreted in terms of the structure of ot and the dissociation process, and are compared with results from the photoionization of OJ, and with theoretical calculations.

Direct photodissociation of SO+ via the 14Σ+ state

“…Besides the prototype case H +, these are essentially limited to the a 4//._+f 4//, transition in O~ [4,5] and some studies on the molecular rare-gas ions He ] [6], Ar~ [7] and Kr~- [8]. A few other examples, which may be mentioned under this category, are Cs] [9] and O + [10].…”

Isotope exchange in disulfur monoxide-water charged complexes: A mass spectrometric and computational study

“…O 3 ·ϩ behaves as a O˙ϩ-donor producing the oxywater cation OOH 2 ·ϩ , the distonic isomer of the conventional more stable radical cation HOOH˙ϩ [28,29]. Such a reactivity rests on the low dissociation energy of O 3 ·ϩ X( 2 A 1 ) into O˙ϩ and O 2 (0.6 eV) [30] and the high O˙ϩ affinity of water (evaluated ϳ81 kcal mol Ϫ1 ) [25,28]. Likewise these data account for the failure to observe any adduct between O 3 ·ϩ and water even at the highest investigated pressures [29].…”

High-resolution pulsed-field-ionization zero-kinetic-energy photoelectron spectroscopic study of the two lowest electronic states of the ozone cation O3+

“…18 This low value for the dissociation energy implies that O 3 ϩ is a very weakly bound molecule and that the ground state potential energy surface is flat and anharmonic.…”

“…16 A value near 12.52 eV has also been suggested on the basis of an analysis of the relevant thermochemical cycles. 18,19 The simulation of the intensity distribution of the first photoelectron band led Müller, Köppel, and Cederbaum to propose that the spectral feature near 12.44 eV actually corresponds to a hot band. 27 In the present study, the pulsed-field-ionization zerokinetic-energy ͑PFI-ZEKE͒ photoelectron spectrum of O 3 was recorded with a resolution two to three orders of magnitude higher than in previous investigations.…”

“…In NO 2 , the crossing point is located in the near infrared (Ϸ10 000 cm Ϫ1 above the ground state͒ and leads to extensive perturbations of the vibronic structure in the entire visible spectrum. 8 The O 3 ϩ cation has been studied using conventional photoelectron spectroscopy, [10][11][12][13][14][15] photoionization mass spectrometry, 16,17 photofragment spectroscopy, 18 and electron impact ionization. 19 Already the early HeI photoelectron spectroscopic studies showed that the lowest three cationic electronic states 1 2 A 2 , 1 2 A 1 , and 1 2 B 2 are located within an energy interval of only about 1 eV ͑the lowest two states are almost degenerate and could not be resolved in the HeI spectra͒.…”