Dissociative electron impact ionization of N2O5

Abedi, Azra; Cicman, P.; Coupier, B.; Gulejova, B.; Buchanan, G. A.; Marston, George; Mason, Nigel J.; Scheier, P.; Märk, T.D.

doi:10.1016/j.ijms.2003.12.006

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…The desorption can occur in several ways: for instance, by decomposition of NO 3 − to NO 2 (g) and Ti 4+ −O − (ads). Another possibility, promoted by the nitrate stabilization found in this work, could be a combination of NO 3 − and s-NO 3 − into a neutral N 2 O 5 molecule (dissociates into NO 2 in the mass spectrometer), 42 a reaction analogous to N 2 O 5 formation on aerosols. 43 Another possibility is that a neutral NO 2 molecule desorbs from s-NO 3 − , such that the remaining hole stimulates the simultaneous recombination of two NO 3 − into an N 2 O 5 and a surface adatom.…”

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confidence: 89%

Adsorption and Oxidation of NO₂ on Anatase TiO₂: Concerted Nitrate Interaction and Photon-Stimulated Reaction

2022

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The catalytic and photon-induced oxidation of NO 2 on anatase TiO 2 has been studied and compared with the surface nitrate species obtained after adsorption of HNO 3 . Using a combination of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), density functional theory (DFT), and temperature-programmed desorption (TPD), it is shown that identical products are obtained in all reaction systems but that their formation rates differ significantly. The surface reaction products are identified as combinations of surface−NO 3 − species, where NO 2 bonds to the lattice oxygen, and freely adsorbed NO 3 − ions. These products can be obtained either by dissociative adsorption of HNO 3 or by catalytic/photocatalytic oxidation of NO 2 , which is facilitated by UV light. A concerted reaction mechanism is unraveled that involves reorientation of bidentate nitrate that pushes out a neighboring protonated lattice oxygen to form a surface−NO 3 − species and a terminal OH group. The thermal stability of these surface species has been studied by means of TPD and simultaneous in situ DRIFTS measurements that reveal a main desorption peak (m/z = 46) at around 430 °C, which is attributed to concerted nitrate desorption through pentoxide (N 2 O 5 ) formation. A weaker and broader TPD peak is found at about 185 °C and is attributed to desorption of nitrate species bonded in a compressed configuration. The experimental results can be explained by the changing stability of the identified nitrate products, which depends strongly on the surface chemical environment and the surface coverage. The DFT results show that the stabilization of intermediate NO 2 adsorbates and the final nitrate reaction products occurs through a bifunctional charge exchange mechanism that is mediated by the TiO 2 crystal. In particular, a stable surface−NO 3 − and NO 3 − ion pair configuration has been identified. This mechanism explains both the thermal and photoinduced oxidation of NO 2 and their thermal stability and different formation rates, yielding high photoinduced oxidation reaction rates. Our results provide insights into the structure and chemical stability of nitrate surface products on TiO 2 particles and their formation mechanism, which is important for understanding their catalyzed transformation into the harmful compounds HONO and N 2 O during continued UV light illumination.

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Adsorption and Oxidation of NO₂ on Anatase TiO₂: Concerted Nitrate Interaction and Photon-Stimulated Reaction

2022

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“…Nitric oxide (NO), nitrous oxide (N 2 O), nitrogen dioxide (NO 2 ), along with nitrate radical (NO 3 ) and nitrogen pentoxide (N 2 O 5 ), are important minor constituents found at different altitudes of the Earth's atmosphere (Abedi et al 2004). NO is a significant neutral constituent of the thermosphere.…”

Section: Introductionmentioning

confidence: 99%

“…N 2 O 5 plays a prominent role in the chemistry of both Earth's troposphere and stratosphere. In the stratosphere it is a reservoir molecule for the NO x species (Abedi et al 2004). Further, there are studies on NO molecules oriented near metal surfaces (Lemoina 1994).…”

Section: Introductionmentioning

confidence: 99%

Electron scattering and ionization of NO, N₂O, NO₂, NO₃and N₂O₅molecules: theoretical cross sections

Joshipura

Gangopadhyay

Vaishnav³

2006

J. Phys. B: At. Mol. Opt. Phys.

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We have investigated the scattering of electrons from atmospheric molecules NO, N2O, NO2, NO3 and N2O5 at incident electron energy Ei from the ionization threshold (∼10 eV) to 2000 eV. Basically total cross sections for elastic and inelastic collisions are calculated and hence total ionization cross sections are deduced in the ‘complex scattering potential-ionization contribution’ method, developed earlier. Various calculated cross sections are compared extensively with experimental and theoretical data wherever possible. Recommended data can now be prepared for the well-known NO target. New results are presented for lesser known targets.

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“…Dinitrogen pentoxide, for example, tends to decompose faster on metal than on glass and its absorption cross section is uncertain by several percent. 42,43 Similiar to thermal decomposition in the gas phase, which might already be appreciable depending on the pressure conditions, the surface decomposition of N 2 O 5 in the heated Baratron sensor (45 • C) is likely even more important. Because utilization of a buffer gas system avoids exposure to elevated temperatures on the one hand and, on the other hand, allows to freely chose the most appropriate surface material such as glass or PTFE, a buffer system provides a valuable option for precision measurements on pure N 2 O 5 .…”

Section: Discussionmentioning

confidence: 99%

Preparation and accurate measurement of pure ozone

Janssen¹,

Simone²,

Guinet³

2011

Review of Scientific Instruments

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Preparation of high purity ozone as well as precise and accurate measurement of its pressure are metrological requirements that are difficult to meet due to ozone decomposition occurring in pressure sensors. The most stable and precise transducer heads are heated and, therefore, prone to accelerated ozone decomposition, limiting measurement accuracy and compromising purity. Here, we describe a vacuum system and a method for ozone production, suitable to accurately determine the pressure of pure ozone by avoiding the problem of decomposition. We use an inert gas in a particularly designed buffer volume and can thus achieve high measurement accuracy and negligible degradation of ozone with purities of 99.8% or better. The high degree of purity is ensured by comprehensive compositional analyses of ozone samples. The method may also be applied to other reactive gases.

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Dissociative electron impact ionization of N2O5

Cited by 12 publications

References 20 publications

Adsorption and Oxidation of NO₂ on Anatase TiO₂: Concerted Nitrate Interaction and Photon-Stimulated Reaction

Adsorption and Oxidation of NO₂ on Anatase TiO₂: Concerted Nitrate Interaction and Photon-Stimulated Reaction

Electron scattering and ionization of NO, N₂O, NO₂, NO₃and N₂O₅molecules: theoretical cross sections

Preparation and accurate measurement of pure ozone

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Dissociative electron impact ionization of N2O5

Cited by 12 publications

References 20 publications

Adsorption and Oxidation of NO2 on Anatase TiO2: Concerted Nitrate Interaction and Photon-Stimulated Reaction

Adsorption and Oxidation of NO2 on Anatase TiO2: Concerted Nitrate Interaction and Photon-Stimulated Reaction

Electron scattering and ionization of NO, N2O, NO2, NO3and N2O5molecules: theoretical cross sections

Preparation and accurate measurement of pure ozone

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Adsorption and Oxidation of NO₂ on Anatase TiO₂: Concerted Nitrate Interaction and Photon-Stimulated Reaction

Adsorption and Oxidation of NO₂ on Anatase TiO₂: Concerted Nitrate Interaction and Photon-Stimulated Reaction

Electron scattering and ionization of NO, N₂O, NO₂, NO₃and N₂O₅molecules: theoretical cross sections