Temperature-dependent absorption cross-sections of N2O5

Harwood, Matthew H.; Jones, R. L.; Cox, R. A.; Lutman, E. R.; Rattigan, Oliver V.

doi:10.1016/1010-6030(93)90001-2

Cited by 22 publications

(12 citation statements)

References 20 publications

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“…The gas-phase infrared spectrum of ClONO 2 at 298 K was obtained using a Nicolet 7000 series FTIR, and agreed with literature data showing HCl and HNO 3 impurities. 101,102 When ClONO 2 is exposed to ice (∼2.4 L exposure), HOCl is formed 78,87 and thermal desorption data indicate that only HOCl, HNO 3 , and H 2 O desorb from this ice sample.…”

Section: Methodsmentioning

confidence: 99%

Second Harmonic Generation Studies of Ozone Depletion Reactions on Ice Surfaces under Stratospheric Conditions

1999

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Hypochlorous acid, HOCl, an important species in the proposed heterogeneous mechanism for stratospheric ozone depletion, has been observed directly at submonolayer amounts on a single crystalline basal ice surface at 155-188 K, using the nonlinear optical method second harmonic generation. The ice is held in equilibrium with its vapor pressure. Second harmonic generation signals from 290 to 310 nm spectroscopically characterize the species and enable us to follow isothermal desorption kinetics in situ. HOCl desorbs as a single species with a ∆G des / ) 48 ( 4 kJ/mol, close to the cohesive energy of ice itself. The lifetime of HOCl on the clean ice surface at 185 K is estimated to be 4 s and the equilibrium surface coverage at 10 -11 Torr HOCl to be around 4 × 10 11 molecules/cm 2 , corresponding to about 0.1% of a monolayer. However, these same measurements performed on ice predosed with varying amounts of HNO 3 show that the HOCl lifetime is lengthened by coadsorbed HNO 3 , depending on the HNO 3 surface density.

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Section: Methodsmentioning

confidence: 99%

Second Harmonic Generation Studies of Ozone Depletion Reactions on Ice Surfaces under Stratospheric Conditions

1999

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“…37 The products of the N 2 O 5 photolysis are NO 3 at a quantum yield of 1, and a mixture of NO 2 , electronically excited NO 2 * and NO + O, where the amount of NO 2 * depends on the wavelength of the actinic flux. 50,56 Due to the insignificant thermal decomposition of N 2 O 5 in the stratosphere, photolysis is responsible for the daytime re-release of NO x from its nocturnal N 2 O 5 reservoir. In many cases reactions (R1.4) and (R1.7) dominate the diurnal cycle of stratospheric NO x .…”

Section: Introductionmentioning

confidence: 99%

Nighttime radical observations and chemistry

2012

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The nitrate radical, NO(3), is photochemically unstable but is one of the most chemically important species in the nocturnal atmosphere. It is accompanied by the presence of dinitrogen pentoxide, N(2)O(5), with which it is in rapid thermal equilibrium at lower tropospheric temperatures. These two nitrogen oxides participate in numerous atmospheric chemical systems. NO(3) reactions with VOCs and organic sulphur species are important, or in some cases even dominant, oxidation pathways, impacting the budgets of these species and their degradation products. These oxidative reactions, together with the ozonolysis of alkenes, are also responsible for the nighttime production and cycling of OH and peroxy (HO(2) + RO(2)) radicals. In addition, reactions of NO(3) with biogenic hydrocarbons are particularly efficient and are responsible for the production of organic nitrates and secondary organic aerosol. Heterogeneous chemistry of N(2)O(5) is one of the major processes responsible for the atmospheric removal of nitrogen oxides as well as the cycling of halogen species though the production of nitryl chloride, ClNO(2). The chemistry of NO(3) and N(2)O(5) is also important to the regulation of both tropospheric and stratospheric ozone. Here we review the essential features of this atmospheric chemistry, along with field observations of NO(3), N(2)O(5), nighttime peroxy and OH radicals, and related compounds. This review builds on existing reviews of this chemistry, and encompasses field, laboratory and modelling work spanning more than three decades.

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“…Nitrogen containing inorganic species (NO 3 , N 2 O 5 , HONO 2 , HO 2 NO 2, PAN, ClONO, ClNO 2 , and ClONO 2 ) can produce NO 2 by photodissociation which can happen inside the detection cell. N 2 O 5 (Harwood et al, 1993), HONO 2 (Burkholder et al, 305 1993), HO 2 NO 2 (Singer et al, 1989) , PAN (Talukdar et al, 1995), and ClONO (Molina and Molina, 1977) are not known to photo-dissociate at this wavelength. The absorption cross-sections for ClONO 2 (Molina and Molina, 1979) and ClNO 2 (Ghosh et al, 2012) are smaller by about 4 orders of magnitude compared to that of NO 2 at 449 nm.…”

Section: Interferences By Other Species 295mentioning

confidence: 97%

Response to the Reviewer 3

Javed¹

2018

Preprint

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GANDALF (Gas Analyzer for Nitrogen Dioxide Applying Laser-induced Fluorescence), a new instrument for the detection of nitrogen dioxide based on the laser-induced fluorescence (LIF) technique, is presented in this paper. GANDALF is designed for ground based and airborne deployment with a robust calibration system. In the current setup, it uses a multi-mode diode laser (447-450 nm) and performs in situ, continuous, and autonomous measurements with a laser pulse repetition rate of 5 MHz. The performance of GANDALF was tested during the field experiment at a forested location with urban influence where 20 NO x levels were between 0.12 and 22 parts per billion by volume (ppb v). Based on the field results, the limit of detection is estimated at 5-10 parts per trillion by volume (ppt v) in 60 s at a signal to noise ratio (SNR) of 2. The overall accuracy and precision of the instrument are better than 5 % (1 σ) and 0.5 % + 3 ppt v (1 σ min-1), respectively. A comparison of nitrogen dioxide measurements based on several techniques during the field campaign is presented to explore methodic differences.

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Temperature-dependent absorption cross-sections of N2O5

Cited by 22 publications

References 20 publications

Second Harmonic Generation Studies of Ozone Depletion Reactions on Ice Surfaces under Stratospheric Conditions

Second Harmonic Generation Studies of Ozone Depletion Reactions on Ice Surfaces under Stratospheric Conditions

Nighttime radical observations and chemistry

Response to the Reviewer 3

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