The Spectrum of Molecular Oxygen

Krupenie, Paul H.

doi:10.1063/1.3253101

Cited by 958 publications

(366 citation statements)

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“…9͒ is unchanged with respect to the gas-phase value of 194 meV. 27 Core-level photoelectron spectra likewise show no significant shift relative to gas-phase values. 10 Any charge transfer leading to the formation of chemisorbed peroxo O 2 Ϫ species would lead to a weakening of the O 2 bond and would be evident from a pronounced shift of the O 1s core level in photoemission as well as a reduction of the stretch frequency to about 140 meV.…”

Section: Molecular Mechanics Calculationsmentioning

confidence: 70%

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Ulbricht

Moos²,

Hertel³

2002

Phys. Rev. B

186

138

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We present a study on the kinetics of oxygen adsorption and desorption from single-wall carbon nanotube ͑SWNT͒ and highly oriented pyrolytic graphite ͑HOPG͒ samples. Thermal-desorption spectra for SWNT samples show a broad desorption feature peaked at 62 K, which is shifted to a significantly higher temperature than the low-coverage desorption feature on HOPG. The low-coverage O 2 binding energy on SWNT bundles ͑18.5 kJ/mol͒ is 55% higher than that for adsorption on HOPG ͑12.0 kJ/mol͒. In combination with molecular mechanics calculations we show that the observed binding energies for both systems can be attributed to van der Waals interactions, i.e., physisorption. The experiments provide no evidence for a more strongly bound chemisorbed species or for dissociative oxygen adsorption.

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Section: Molecular Mechanics Calculationsmentioning

confidence: 70%

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Ulbricht

Moos²,

Hertel³

2002

Phys. Rev. B

186

138

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“…The volume susceptibility of dry air is ≈ 3.7 × 10 −7 [19] at 1013 hPa, to increase n by ≈ 1.3×10 −7 . The magnetic dipole transitions of Oxygen [10,38] are incorporated in the HITRAN list [13], which allows us to add dispersion to their response. (Since we are only dealing with the limit of small susceptibilities, the electric and magnetic susceptibilities are additive, which means cross product terms have been neglected here.)…”

Section: Magnetic Susceptibilitymentioning

confidence: 99%

Refractive index of humid air in the infrared: model fits

Mathar¹

2007

J. Opt. A: Pure Appl. Opt.

111

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The theory of summation of electromagnetic line transitions is used to tabulate the Taylor expansion of the refractive index of humid air over the basic independent parameters (temperature, pressure, humidity, wavelength) in five separate infrared regions from the H to the Q band at a fixed percentage of Carbon Dioxide. These are least-squares fits to raw, highly resolved spectra for a set of temperatures from 10 to 25 • C, a set of pressures from 500 to 1023 hPa, and a set of relative humidities from 5 to 60%. These choices reflect the prospective application to characterize ambient air at mountain altitudes of astronomical telescopes. The paper provides easy access to predictions of the refractive index of humid air at conditions that are typical in atmospheric physics, in support of ray tracing [5] and astronomical applications [4,16,47,50] until experimental coverage of the infrared wavelengths might render these obsolete. The approach is in continuation of earlier work [46] based on a more recent HITRAN database [60] plus more precise accounting of various electromagnetic effects for the dielectric response of dilute gases, as described below.The literature of optical, chemical and atmospheric physics on the subject of the refractive index of moist air falls into several categories, sorted with respect to decreasing relevance (if relevance is measured by the closeness to experimental data and the degree of independence to the formalism employed here):1. experiments on moist air in the visible [3,9,18,53 [42,61,79] and eventually in the static limit [24], the refractive index plotted as a function of wavelength is more and more structured by individual lines. Since we will not present these functions at high resolution but smooth fits within several bands in the infrared, their spiky appearance sets a natural limit to the far-IR wavelength regions that our approach may cover. II. DIELECTRIC MODEL A. MethodologyThe complex valued dielectric function n(ω) of air n = 1 +χ (1) is constructed from molecular dynamical polarizabilitiesN m are molecular number densities, S ml are the line intensities for the transitions enumerated by l. ω 0ml are the transition angular frequencies, Γ ml the full linewidths at half maximum. c is the velocity of light in vacuum, and i the imaginary unit. The line shape (2) adheres to the complex-conjugate symmetry χ m (ω) = χ * m (−ω), as required for functions which are real-valued in the time domain. The sign convention of Γ ml merely reflects a sign choice in the Fourier Transforms and carries no real significance; a sign in the Kramers-Kronig formulas is bound to it. The integrated imaginary part is [28] whereν = k/(2π) = ω/(2πc) = 1/λ is the wavenumber.

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“…The nature of the Wulf bands whose intensity is proportional to the square of the pressure is still controversial: They are attributed either to the 04 dimer, to the (02) 2 collision complex or to collision-induced absorption (CIA) [19][20][21][22].…”

Section: The Wulf Bandsmentioning

confidence: 99%

Absorption cross-sections of atmospheric constituents: NO2, O2, and H2O

Hermans

Vandaele

Carleer

et al. 1999

Environ. Sci. & Pollut. Res.

130

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Absorption spectroscopy, which is widely used for concentration measurements of tropospheric and stratospheric compounds, requires precise values of the absorption cross-sections of the measured species. NO v 02 and its collision-induced absorption spectrum, and H20 absorption cross-sections have been measured at temperature and pressure conditions prevailing in the Earth's atmosphere. Corrections to the generally accepted analysis procedures used to resolve the convolution problem are also proposed.

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The Spectrum of Molecular Oxygen

Cited by 958 publications

References 0 publications

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Physisorption of molecular oxygen on single-wall carbon nanotube bundles and graphite

Refractive index of humid air in the infrared: model fits

Absorption cross-sections of atmospheric constituents: NO2, O2, and H2O

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