Absolute yields of CO(a′ 3Σ+, d 3Δi,e 3Σ−)+O from the dissociative recombination of CO2+ ions with electrons

Rosati, Richard E.; Johnsen, Rainer; Golde, Michael F.

doi:10.1063/1.1623480

Cited by 22 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To evaluate the contribution of this source, we use the results from the study by Fox [2004] where the densities of CO 2 + and electrons were calculated for low solar activity. Using these values of densities, the electron temperature adopted by Hanson et al [1977], the rate coefficient of Seiersen et al [2003], and the recent measurements of branching ratios of dissociative recombination of CO 2 + into the a 3 Π state (equal to 0.18 according to Skrzypkowski et al [1998] and Rosati et al [2003]), the contribution of the CO 2 + dissociative recombination can be evaluated. This production rate is shown in Figure 4 (middle).…”

Section: Resultsmentioning

confidence: 99%

Monte Carlo model of electron transport for the calculation of Mars dayglow emissions

Shematovich¹,

Bisikalo²,

Gérard³

et al. 2008

J. Geophys. Res.

View full text Add to dashboard Cite

[1] A model of the photoelectron collision-induced component of the Mars dayglow using recent cross sections and solar flux is described. The calculation of the photoelectron source of excitation is based on a stochastic solution of the Boltzmann equation using the direct simulation Monte Carlo method. The neutral atmosphere is taken from outputs of a global circulation model, and recent inelastic collision cross sections are adopted. The calculated vertical profiles of the CO Cameron bands and CO 2 + doublet emissions integrated along the line of sight compare well with the Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) limb profiles observed with the SPICAM spectrograph on board Mars Express made at Ls = 166°during the summer season at northern midlatitudes. The comparison shows agreement to within the uncertainties of the excitation cross sections. Seasonal changes in the brightness and the altitude of the emission peaks are predicted with intensity variations in the range 15-20%.

show abstract

Section: Resultsmentioning

confidence: 99%

Monte Carlo model of electron transport for the calculation of Mars dayglow emissions

Shematovich¹,

Bisikalo²,

Gérard³

et al. 2008

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Later data (Tsuji et al, 1995) showed a very small population in v ¼ 2, the highest level detected, consistent with this. However, it would be surprising if this were also the case for the CO(a 03 S þ ) data, since the authors (Rosati et al, 2003) are well aware of this potential problem. The populations for the CO(d 3 D i ) are however quite consistent between the two recent sets of data.…”

Section: Internal Excitation Of Recombination Productsmentioning

confidence: 99%

“…Vibrational state populations of electronically excited states generated in the electron dissociative recombination of CO þ 2 , HCO þ and N 2 H þ . a: For CO þ 2 , comparisons of data sets are given: CO(A 1 Q ) a (Tsuji et al, 1995) b (Gutcheck and Zipf, 1973), dotted lines; CO(d 3 D I ) g (Tsuji et al, 1998) d (Rosati et al, 2003), solid lines; CO(a 03 S þ ) e (Rosati et al, 2003) f (Tsuji et al, 1998), dashed lines. b: For all data.…”

Section: A Quantum Nature Of Recombinationmentioning

confidence: 99%

Electron molecular ion recombination: Product excitation and fragmentation

Adams

Poterya

Babcock

2006

Mass Spectrometry Reviews

View full text Add to dashboard Cite

Electron-ion dissociative recombination is an important ionization loss process in any ionized gas containing molecular ions. This includes the interstellar medium, circumstellar shells, cometary comae, planetary ionospheres, fusion plasma boundaries, combustion flames, laser plasmas and chemical deposition and etching plasmas. In addition to controlling the ionization density, the process generates many radical species, which can contribute to a parallel neutral chemistry. Techniques used to obtain rate data and product information (flowing afterglows and storage rings) are discussed and recent data are reviewed including diatomic to polyatomic ions and cluster ions. The data are divided into rate coefficients and cross sections, including their temperature/energy dependencies, and quantitative identification of neutral reaction products. The latter involve both ground and electronically excited states and including vibrational excitation. The data from the different techniques are compared and trends in the data are examined. The reactions are considered in terms of the basic mechanisms (direct and indirect processes including tunneling) and recent theoretical developments are discussed. Finally, new techniques are mentioned (for product identification; electrostatic storage rings, including single and double rings; Coulomb explosion) and new ways forward are suggested.

show abstract

“…Rate coefficients for ionneutral reactions are taken from Fox and Sung (2001). Recently, Seiersen et al (2003) have measured recombination rates for the e-CO + 2 collision, with yield of 0.87 for the channel producing CO of which CO(a 3 Π) production yield is 0.29 (Skrzypkowski et al, 1998;Rosati et al, 2003). Ion and electron temperatures are taken from Fox (2009).…”

Section: Modelmentioning

confidence: 99%

Impact of solar EUV flux on CO Cameron band and CO2+ UV doublet emissions in the dayglow of Mars

Jain

Bhardwaj

2012

Planetary and Space Science

View full text Add to dashboard Cite

This study is aimed at making a calculation about the impact of the two most commonly used solar EUV flux models -SOLAR2000 (S2K) of Tobiska (2004) and EUVAC model of Richards et al. (1994) -on photoelectron fluxes, volume emission rates, ion densities and CO Cameron and CO + 2 UV doublet band dayglow emissions on Mars in three solar activity conditions: minimum, moderate, and maximum. Calculated limb intensities profiles are compared with SPICAM/Mars Express and Mariner observations. Analytical yield spectrum (AYS) approach has been used to calculate photoelectron fluxes in Martian upper atmosphere. Densities of prominent ions and CO molecule in excited triplet a 3 Π state are calculated using major ion-neutral reactions. Volume emission rates of CO Cameron and CO + 2 UV doublet bands have been calculated for different observations (Viking condition, Mariner and Mars Express SPICAM observations) on Mars. For the low solar activity condition, dayglow intensities calculated using the S2K model are∼40% higher than those calculated using the EUVAC model. During high solar activity, due to the higher EUV fluxes at wavelengths below 250Å in the EUVAC model, intensities calculated using EUVAC model are slightly higher (∼20%) than those calculated using S2K model. Irrespective of the solar activity condition, production of Cameron band due to photodissociative excitation of CO2 is around 50% higher when S2K model is used. Altitude of peak limb brightness of CO Cameron and CO + 2 UV doublet band is found to be independent of solar EUV flux models. Calculated limb intensities of CO Cameron and CO + 2 UV doublet bands are on an average a factor of ∼2 and ∼1.5, respectively, higher than the SPICAM Mars Express observation, while they are consistent with the Mariner observations.

show abstract

Absolute yields of CO(a′ 3Σ+, d 3Δi,e 3Σ−)+O from the dissociative recombination of CO2+ ions with electrons

Cited by 22 publications

References 25 publications

Monte Carlo model of electron transport for the calculation of Mars dayglow emissions

Monte Carlo model of electron transport for the calculation of Mars dayglow emissions

Electron molecular ion recombination: Product excitation and fragmentation

Impact of solar EUV flux on CO Cameron band and CO2+ UV doublet emissions in the dayglow of Mars

Contact Info

Product

Resources

About