Double photoionization of N2O molecules in the 28–40eV energy range

Angular Distributions of Fragment Ions Produced by Coulomb Explosion of Simple Molecular Dications of Astrochemical Interest

“…Recently, we have reported the photon energy dependence of the two dissociative processes leading to N + +NO + and O + +N 2 + products in the 30-40 eV energy range, finding that the former exhibits a probability about four times higher than the latter [18,37]. In the whole investigated energy range, we observed the two dissociation channels reported below with a threshold energy of about 32.2 eV: Fig.…”

Molecular Dications in Planetary Atmospheric Escape

“…On the other hand, the importance of carbon dioxide and nitrous oxide are well known in the Earth's atmosphere where both species are important greenhouse gases and N 2 O can participate in ozone depletion [49,50]. Moreover, CO 2 is the main component of the Mars (95.3%) and Venus (96.5%) atmospheres and, together with acetylene molecules, has been detected as a minor component in Titan's atmosphere (2-4 ppm and about 10 ppb, respectively) [51].…”

“…Recorded correlation time diagrams have shown that, for energies below the vertical threshold for the N2O 2+ dication formation (35.8 eV), autoionizing states are formed, followed by dissociative autoionization finally leading to ion products of both Reactions (5) and (6). By increasing the photon energy, N2O 2+ can be formed above the threshold, and also in this case, it dissociates through the same channels by a direct Coulomb explosion [49]. Now, we are able to analyze our data using the same procedure already discussed for CO2, providing the total kinetic energy of ionic fragments as a function of the investigated photon energy.…”

“…(5) and (6) reported below, respectively). According to a previous study [49], to which we refer for an overview of the experimental and theoretical works already performed by several research groups, no stable N 2 O 2+ molecular dications have been observed in our experiment, indicating that the lifetime of the produced molecular dications is never longer than 10 −6 s, which was the typical average time-of-flight of the ions in our detection device. In the whole investigated energy range, we observed the two dissociation channels reported below with a threshold energy of about 32.2 eV:…”

The Escape of O^+ and CO^+ Ions from Mars and Titan Atmospheres by Coulomb Explosion of CO22+ Molecular Dications

“…They have been recorded by double photoionization experiments performed at the ELETTRA Synchrotron Light Laboratory (Trieste, Italy) using the angle-resolved photoemission spectroscopy (ARPES) end station of the gas phase beamline. Details about the beamline and the end station have been already reported elsewhere [27,28], and the apparatus used for the experiment discussed here has also been described previously [29][30][31]. Therefore, only some features relevant for the present investigation are outlined here.…”