Journal ArticleDOI
The quenching of metastable O2(1Δg) and O2(1Σg+) molecules
TLDR
In this article, the rate constants for the deactivation of O2(1Δg) and relative rate constants of O 2(1 Δg+) have been deduced.About:
This article is published in Chemical Physics Letters.The article was published on 1971-02-01. It has received 164 citations till now. The article focuses on the topics: Quenching (fluorescence) & Reaction rate constant.read more
Citations
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Physical mechanisms of generation and deactivation of singlet oxygen.
TL;DR: Reactions of O2(∆g) are associated with significant applications in several fields, including organic synthesis, bleaching processes, and, most importantly, the photodynamic therapy of cancer, which has now obtained regulatory approval in most countries for the treatment of several types of tumors.
Journal ArticleDOI
Kinetic model of a low-pressure N/sub 2/-O/sub 2/ flowing glow discharge
B.F. Gordiets,Carlos M. Ferreira,Vasco Guerra,J Loureiro,J Nahorny,D. Pagnon,Michel Touzeau,M Vialle +7 more
TL;DR: In this article, a self-consistent kinetic model was developed to study dc flowing glow discharges in N/sub 2/O/Sub 2/ mixtures, which includes the calculation of electron energy distribution functions and electron rate coefficients coupled with detailed vibrational kinetics of N/ sub 2/ molecules, chemical kinetics taking into account of neutral, excited and charged species, interaction of N and O atoms at the discharge tube wall, and the thermal balance of the discharge.
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Flame propagation enhancement by plasma excitation of oxygen. Part I: Effects of O3
TL;DR: In this article, the thermal and kinetic effects of O(sub 3) on flame propagation were investigated experimentally and numerically by using C{sub 3}H{sub 8}/O(sub 2}/N{sub 2}) laminar lifted flames.
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Pure singlet oxygen cytotoxicity for bacteria
TL;DR: Physical separation of the photosensitizer and the bacteria eliminates the possibility of direct interaction between bacteria and photoexcited sensitizers that could lead to Type I (non‐singlet oxygen) photooxidation processes, which was used to examine the bacterial cytotoxicity of singlet oxygen.
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ETON 2: Quenching parameters for the proposed precursors of O2(b1Σg+) and O(1S) in the terrestrial nightglow
Ian C. McDade,Donal P. Murtagh,R.G.H. Greer,P.H.G. Dickinson,Georg Witt,Jacek Stegman,E. J. Llewellyn,L. Thomas,D.B. Jenkins +8 more
TL;DR: In this paper, the authors used the volume emission profiles of the O 2 (b 1 Σ g + − X 3 Σg t - )( O - O ) Atmospheric Band and the O( 1 S- 1 D) green line to test the hypothesis that both emissions are excited by Barth type mechanisms.
References
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Journal ArticleDOI
Absolute Intensities of the Discrete and Continuous Absorption Bands of Oxygen Gas at 1.26 and 1.065 μ and the Radiative Lifetime of the 1Δg State of Oxygen
TL;DR: The radiative half-life of isolated 1Δg oxygen molecules is estimated to be 45 min, and the effect of gas pressure on the rate of decay has been predicted.
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Optical Emission from O(1D) and O2(b 1Σg) in Ultraviolet Photolysis of O2 and CO2
TL;DR: The presence of O(1D) has been detected via 6300 A emission in ultraviolet photolysis of O2 and CO2 Quenching rates for O( 1D) and O2(1Σg) have been measured for O2, N2, CO2, and CO as mentioned in this paper.
Journal ArticleDOI
Dayglow of the oxygen A band
L. Wallace,D. M. Hunten +1 more
Abstract: Rocket observations of O2 dayglow have been obtained by means of spectrometers and photometers. Results for the A band (0–0 band of the atmospheric system) cover the range 35–128 km, and for the 0–1 band 59–95 km. Spurious effects attributed to dust particles and clouds from the rocket have also been observed. A detailed analysis of the observations is given, taking account of the fact that they were made in an optically thick atmosphere. Three major production processes have been identified: energy transfer from O(¹D), dominant above 100 km; resonance scattering, dominant from 65 to 100 km; and photolysis of ozone, dominant from 35 to 65 km, and probably important up to 100 km. In the region 85–100 km, an alternative to the ozone source, a chemiluminescent reaction as in the nightglow, suffers difficulties that make it less probable. It is thus likely that a good estimate is now available for daytime ozone concentrations up to 100 km. Collisional quenching at a rate proportional to atmospheric density is found, and the rate coefficient for air molecules is 1.4 × 10−15 cm³ sec−1. This quenching is fast enough to suppress the effects of multiple scattering, including the Bates fluorescence that could convert 0–0 photons into 0–1. The observed photon intensity ratio of 17±2 is therefore not perturbed by this fluorescence. A discussion is given of the effects of varying solar zenith angle, and calculated results are shown, A perturbation in the 110–130 km region is attributed to a ‘wave’ in the distribution of O2, caused by a similar variation in the flux due to eddy mixing. The calculation of transmission functions for a self-absorbed band and the production and transmission of the nightglow emission are discussed in the appendixes.
Journal ArticleDOI
Deactivation of O(1D)
Robert A. Young,Graham Black +1 more
TL;DR: In this article, the authors measured the emission rate of O2(b 1 εg+) produced in the energy transfer reaction O(1D)+O2→O2b 1εg+O(3P), whose rate coefficient is greater than 10−11 cm3/sec, as a function of [O2] and [He].