The ratio rho/5577// rho/N sub 2 super plus first negative/ in the aurora.
Ratio of volume emission rates of 5577 A and band of positive N molecular ion first negative system for use in auroral observations
Murcray, W. B.↗
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Results for “MOLECULAR ION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A combined electron impact-field ionization source and its application in organic geochemistry.
Electron impact field ionization source for mass measurement of molecular ions, noting organic geochemistry applications
Burlingame, A. L.↗
Study of different approximations in the calculation of g-tensors: H2(plus)
Approximations in calculating g-tensors for molecular ion H2 (plus)
De Montgolfier, P.↗
Mass spectrometry in structural and stereochemical problems. CXCIII
Valeraldehyde o-nitrophenylhydrazone mass spectrum with low intensity peak due to combined hydroxyl and water loss from molecular ion
Djerassi, C.↗
Absolute oscillator strengths for the CH/plus/, CD/plus/, and BH A super 1 pi to X super 1 sigma/plus/ transition
Boron and carbon hydrides and carbon deuteride molecular ions radiative lifetime measurements, computing absolute oscillator strengths
Smith, W. H.↗
Crossed-beam study of the reaction N/plus/ and O2 leading to NO/plus/ and O
Crossed beam model of nitrogen ion-molecular oxygen reactions in upper atmosphere as function of collision energy
Herman, Z.↗
Application of the statistical phase-space theory to the reactions of rare-gas ions with nitrogen molecules
Rare gas ions molecular and dissociative charge transfer reactions with nitrogen, using statistical phase-space theory of chemical reactions
Fullerton, D. C.↗
Study of different approximation in the calculation of g tensors - H2/+/
The theory of the g tensor in one-electron systems is briefly reviewed and calculations are performed in several ways for the hydrogen molecular ion in order to test approximations which must be made for larger systems. Approximate ground state wavefunctions are determined variationally. The first-order wavefunction with respect to the orbit-field perturbation is calculated, and the second-order g tensor is determined. The results of the various approximate calculations are compared and discussed. It is found that the linear combination of atomic orbitals method is rather poor and that two center integrals cannot be neglected.
De Montgolfier, P.↗
Theoretical study of H2/+/ spectroscopic properties. II, III
Description of the theoretical spectroscopic properties of the 2p pi/sub u/ and 3d sigma/sub g/ excited states of the H2/+/ hydrogen molecular ion. Numerical integration of the Schrodinger equation is used to determine vibration-rotation eigenvalues. Dunham power series expansions are used to determine the equilibrium separation, potential coefficients, and spectroscopic constants. The eigenvalues are used to determine delta-G, Bv, Dv, and Hv.
Beckel, C. L.↗
Approximate spin projection of three-component UHF wavefunctions - The states of the pentachlorocyclopentadienyl cation and the croconate dianion, C5O5/2-/
The approximate spin projection method of Amos et al. is extended to handle UHF wave functions having three significant components of differing multiplicity. An expression is given for the energy after single annihilation which differs from that of Amos and Hall. The new expression reproduces the results obtained from a previous exact calculation for which the weights and energies of the components are known. The extended approximate projection method is applied to the pi-electron UHF wave functions for the ground states of the pentachlorocyclopentadienyl cation and the croconate dianion, C5O5(2-). The results indicate a triplet ground state for the former and a singlet ground state for the latter, in agreement with experimental ESR susceptibility measurements for these molecular ions. C5C15(-) cannont be treated by restricted Hartree-Fock theory, due to its open-shell ground state. Incorrect results are obtained for the croconate dianion, if restricted Hartree-Fock theory and singly excited configuration interactions are utilized.
Phillips, D. H.↗
Chemical-ionization visible and ultraviolet gas lasers: A concept
Charge-transfer reactions or Penning ionization reactions are used to produce population inversions between electronic states of molecular ions which should result in stimulated emission in ultraviolet and visible regions. Such lasers could be used in study of short-lived reaction intermediates, crystal structure and scattering, and photolysis.
Laudenslager, J. B.↗
Venus' night side ionosphere - Its origin and maintenance
A substantial nightside ionosphere has been observed on Venus by both Mariner 5 and Mariner 10. Major dayside ionic species such as O2(+) and other molecular ions have chemical lifetimes much shorter than the 244.3-day rotation period of the planet. Rapid transport of ions from the dayside to the nightside to the extent required seems most unlikely. Consequently, possibilities are investigated for local production of ions on the nightside itself. Constraints imposed by chemical lifetimes require atomic ions with low ionization potentials. It is suggested that metallic ions of meteoric origin are the positive charge carriers, and the plausibility of this mechanism is demonstrated. Other possibilities are examined and shown to be less likely. Meteor ablation on Venus, the aeronomy of metallic species, and the role of negative ions near the electron peaks of the atmosphere are discussed.
Butler, D. M.↗
On the relationship of interstellar N2H/+/, HCO/+/, HCN, and CN
A survey of 73 sources has been made in the emission lines of N2H(+) and HCO(+), including detailed maps of four sources (Ori A, OMC-2, DR 21 OH, and NGC 6334). These data are combined with equally extensive data for HCN and CN to make a detailed study of the spatial relationship of these four species. Actual abundance ratios are shown to vary, often sharply, over small scale lengths (of the order of 1 arcmin) within the mapped sources. Excitation temperatures also vary. All four species appear to be subthermally excited. The abundance ratios and their spatial variations are interpreted in terms of ion-molecular formation and destruction processes. It is concluded that the relative abundances of CO may be considerably lower in some regions than previously believed. No evidence is found for variations in the C/O ratio over small scale lengths in Ori A. The degree of ionization of the Ori A molecular cloud may be significantly different from that of other molecular clouds.
Turner, B. E.↗
Variable fragmentation mass spectrometry using chemi-ionization
A description is given of experiments which provide a verification of three features of Penning ionization mass spectrometry. One of these features is related to the ability to simplify a molecular fragmentation pattern and to intensify the molecular ion peak. Another feature is concerned with the ability to identify uniquely geometric isomers which are indistinguishable using high-energy electron impact methods. The third feature involves the ability to identify components in a mixture, which cannot be discerned using electron impact or chemical ionization methods alone. The investigation shows that Penning ionization is an efficient soft ionization technique which can be used to simplify mass spectra of pure compounds as well as mixtures.
Laudenslager, J. B.↗
Ionospheric chemistry
This report deals primarily with progress in the chemistry of minor neutrals and ionized constituents of the thermosphere. Significant progress was made over the last few years in quantitative studies of many chemical processes. This success was primarily due to the advent of multiparameter multisatellite programs which permitted accurate simultaneous measurements to be made of many important parameters. In many cases studies of chemical reactions were made with laboratory-like precision. Rate coefficients have been derived as functions of temperature for a number of important reactions. New information has been acquired on nearly every major process which occurs in the thermosphere, including the recombination rates of all major molecular ions, charge transfer reactions, ion atom interchange reactions, and reactions of neutral and ionized metastable atoms and molecules.
Torr, D. G.↗
F region airglow - Are ground-based observations consistent with recent satellite results
The Atmosphere Explorer photochemistry is used to interpret simultaneous observations made at the Arecibo Observatory of the OI (6300 A) and NI (5200 A) airglow surface brightness and electron density and temperature profiles measured by incoherent scatter radar. It was found that the theory and the experiment agree for the 5200-A emission; however, it was not possible to obtain to a complete agreement for the 6300-A nightglow. It is suggested that the source of the discrepancy results from one of the parameters used to calculate the production rate of O(lD); the data show evidence of an asymmetrical behavior of the ionosphere between times when the F layer is descending and when it is ascending, with asymmetry probably reflecting the effects of transport on molecular ion densities in the bottom side of the F region.
Cogger, L. L.↗
Saturn ionosphere - Theoretical interpretation
Voyager 1 high latitude and Pioneer 11 equatorial ionospheric structure indicate a solar EUV-controlled ionosphere with a possible molecular ion in the topside. Vibrationally excited H2 in the high latitudes may be an important loss mechanism. Dynamical effects are expected to be important for determining the peak density and its location.
Atreya, S. K.↗
Millimeter and submillimeter spectra of HCO/+/ and DCO/+/
The J = 0-1 transitions of six different isotopic forms of the HCO(+) molecular ion, which were investigated by Woods et al. (1975), are considered. The extension of this work into the shorter millimeter and submillimeter region is reported here, as is the measurement of these spectra through J = 4-5 for HCO(+) and J = 5-6 for DCO(+). It is noted that these measurements can be used to determine accurate rotational constants and rest frequencies for these astrophysically important species. Tables listing the observed rotational constants and spectral constants of HCO(+) and DCO(+) are included.
Sastry, K. V. L. N.↗