Fine Structure in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Σ</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Ground State of the Oxygen Molecule, and the Rotational Intensity Distribution in the Atmospheric Oxygen Band

Schlapp, Robert

doi:10.1103/physrev.51.342

Cited by 148 publications

(99 citation statements)

References 11 publications

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“…The VK bands are modeled using the vibrational and rotational constants tabulated by Huber and Herzberg [1979] with line intensity factors from Schlapp [1937]. Upper state vibrational populations are from Strickland et al [1999], which include the effects of cascade and quenching [Gronoff et al, 2012].…”

Section: The Muv Vk Bandsmentioning

confidence: 99%

New observations of molecular nitrogen in the Martian upper atmosphere by IUVS on MAVEN

Stevens

Evans

Schneider

et al. 2015

Geophysical Research Letters

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We identify molecular nitrogen (N2) emissions in the Martian upper atmosphere using the Imaging Ultraviolet Spectrograph (IUVS) on NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. We report the first observations of the N2 Lyman‐Birge‐Hopfield (LBH) bands at Mars and confirm the tentative identification of the N2 Vegard‐Kaplan (VK) bands. We retrieve N2 density profiles from the VK limb emissions and compare calculated limb radiances between 90 and 210 km against both observations and predictions from a Mars general circulation model (GCM). Contrary to earlier analyses using other satellite data, we find that N2 abundances exceed GCM results by about a factor of 2 at 130 km but are in agreement at 150 km. The analysis and interpretation are enabled by a linear regression method used to extract components of UV spectra from IUVS limb observations.

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Section: The Muv Vk Bandsmentioning

confidence: 99%

New observations of molecular nitrogen in the Martian upper atmosphere by IUVS on MAVEN

Stevens

Evans

Schneider

et al. 2015

Geophysical Research Letters

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“…spectra of orbitally nondegenerate hydrocarbon triplet states can be understood (1,2) on the basis of a Zeeman interaction and a second-order tensor tern1 independent of the field. T h a t is in terms of the spin Hamiltonian T h e zero field splitting tensor G is due primarily (13)(14)(15) …”

Section: Discussionmentioning

confidence: 99%

Spin–spin interactions in polyphenyls

Gardner¹

1967

Can. J. Chem.

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An attempt has been made, with some success, to interpret the zero field splitting parameters for the triplet states of molecules such as the polyphenyls where the subunits are weakly coupled and the molecules are probably nonplanar. The method used was a semi-empirical exciton theory, applied in particular to biphenyl and 1,3,5-triphenylbenzene. I n these two cases it is found that structure information, in particular the angle between rings, obtained by this method is in good agreement with electron diffraction data.Canadian Joutnal of Chemistry. Volume 45, 1707 (1967) The early electron spin resonance (e.s.r.) studies of Hutchison and Mangum (I) and van der IVaals and de Groot (2) have stimulated considerable experimental and theoretical interest in the triplet states of organic molecules. One of the main theoretical concerns has been the correlation of the zero field splitting parameters D and E mith~molecular structure.For the excited triplet states of aromatic molecules such as benzene and naphthalene, as well as various methvlenes and nitrenes which have triplet ground states, the theoretical predictions (3-7) based on molecular orbital descriptions are in good agreement with what is observed experimentally.T h e purpose of the present study is t o investigate the use of an exciton description for the calculation of zero field splitting parameters. This type of model is-widely used in the description of the optical properties of molecular crystals (8, 9). T h e same approach has achieved some success in the description of molecules in which the subunits are weakly coupled, such as linear polyenes (10, 11) and polyphenyls (8, 12).We develop the theory initially to discuss the e.s.r. results of triplet biphenyl and triphenylbenzene. Some discussion of the a~~l i c a t i o n of the model t o molecules such A A as triphenylene is also given.IPresent address: Defence Chemical, Biological and Radiation Laboratories, Ottawa, Canada. DISCUSSIONT h e e.s.r. spectra of orbitally nondegenerate hydrocarbon triplet states can be understood (1,2) on the basis of a Zeeman interaction and a second-order tensor tern1 independent of the field. T h a t is in terms of the spin Hamiltonian T h e zero field splitting tensor G is due primarily (13-15) to the first-order effect of the dipolar spin-spin interaction. In this approximation G is an average over the wave function where and ri, is the vector joining the electrons. (11) BiphenylWe consider biphenyl to consist of two weakly interacting phenyl groups. l4o(A) and 341(A) are the wave functions representing the ground state and first excited triplet state of phenyl group A respectively.T o first order we may then write the ground and lowest triplet molecular wave function as Can. J. Chem. Downloaded from www.nrcresearchpress.com by 54.202.233.140 on 05/11/18For personal use only.

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“…Using the data obtained for the power of the band oscillator, the mean line intensities, and also the data about the position of the lines from [799], and the distribution of their intensities in the band from [801], the authors of [800] calculated the absorption functions for the band in the earth's layer of the atmosphere.…”

Section: Fine Structure and Absorption Functions Of The Oxygen Spectrummentioning

confidence: 99%

Propagation of Visible and Infrared Waves in the Atmosphere (Rasprostranenie Vidimykh i Infrakrasnykh Voln v Atmosfere)

Zuev¹

1972

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Fine Structure in theΣ3Ground State of the Oxygen Molecule, and the Rotational Intensity Distribution in the Atmospheric Oxygen Band

Cited by 148 publications

References 11 publications

New observations of molecular nitrogen in the Martian upper atmosphere by IUVS on MAVEN

New observations of molecular nitrogen in the Martian upper atmosphere by IUVS on MAVEN

Spin–spin interactions in polyphenyls

Propagation of Visible and Infrared Waves in the Atmosphere (Rasprostranenie Vidimykh i Infrakrasnykh Voln v Atmosfere)

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