88 research outputs found
Formation of H by radiative association of H and H in the interstellar medium
We develop the theory of radiative association of an atom and a diatomic
molecule within a close-coupling framework. We apply it to the formation of
H after the low energy collision (below 0.5 eV) of H with H.
Using recently obtained potential energy and permanent dipole moment surfaces
of H, we calculate the lowest rovibrational levels of the H
electronic ground state, and the cross section for the formation of H by
radiative association between H and ortho- and para-H. We discuss the
possibility for the H ion to be formed and observed in the cold and dense
interstellar medium in an environment with a high ionization rate. Such an
observation would be a probe for the presence of H in the interstellar
medium
Atom-Molecule Laser Fed by Stimulated Three-Body Recombination
Using three-body recombination as the underlying process, we propose a method
of coherently driving an atomic Bose-Einstein condensate (BEC) into a molecular
BEC. Superradiant-like stimulation favors atom-to-molecule transitions when two
atomic BECs collide at a resonant kinetic energy, the result being two
molecular BEC clouds moving with well defined velocities. Potential
applications include the construction of a molecule laser.Comment: 4 pgs, 3 figs, RevTeX4, submitted to PRL; Corrected numerical
example
Potential energy and dipole moment surfaces of H3- molecule
A new potential energy surface for the electronic ground state of the
simplest triatomic anion H3- is determined for a large number of geometries.
Its accuracy is improved at short and large distances compared to previous
studies. The permanent dipole moment surface of the state is also computed for
the first time. Nine vibrational levels of H3- and fourteen levels of D3- are
obtained, bound by at most ~70 cm^{-1} and ~ 126 cm^{-1} respectively. These
results should guide the spectroscopic search of the H3- ion in cold gases
(below 100K) of molecular hydrogen in the presence of H3- ions
Ozone Formation in Ternary Collisions: Theory and Experiment Reconciled
The present Letter shows that the formation of ozone in ternary collisions O + O2 + M—the primary mechanism of ozone formation in the stratosphere—at temperatures below 200 K (for M=Ar) proceeds through a formation of a temporary complex MO2, while at temperatures above ∼700 K, the reaction proceeds mainly through a formation of long-lived vibrational resonances of O*3. At intermediate temperatures 200–700 K, the process cannot be viewed as a two-step mechanism, often used to simplify and approximate collisions of three atoms or molecules. The developed theoretical approach is applied to the reaction O + O2 + Ar because of extensive experimental data available. The rate coefficients for the formation of O3 in ternary collisions O + O2 + Ar without using two-step approximations were computed for the first time as a function of collision energy. Thermally averaged coefficients were derived for temperatures 5–900 K. It is found that the majority of O3 molecules formed initially are weakly bound. Accounting for the process of vibrational quenching of the nascent population, a good agreement with available experimental data for temperatures 100–900 K is obtained
Photoassociation of a cold atom-molecule pair: long-range quadrupole-quadrupole interactions
The general formalism of the multipolar expansion of electrostatic
interactions is applied to the calculation the potential energy between an
excited atom (without fine structure) and a ground state diatomic molecule at
large separations. Both partners exhibit a permanent quadrupole moment, so that
their mutual quadrupole-quadrupole long-range interaction is attractive enough
to bind trimers. Numerical results are given for an excited Cs(6P) atom and a
ground state Cs2 molecule. The prospects for achieving photoassociation of a
cold atom/dimer pair is thus discussed and found promising. The formalism can
be easily generalized to the long-range interaction between molecules to
investigate the formation of cold tetramers.Comment: 5 figure
Cross sections and rate coefficients for vibrational excitation of h<inf>2</inf>o by electron impact
Cross-sections and thermally averaged rate coefficients for vibration (de-)excitation of a water molecule by electron impact are computed; one and two quanta excitations are considered for all three normal modes. The calculations use a theoretical approach that combines the normal mode approximation for vibrational states of water, a vibrational frame transformation employed to evaluate the scattering matrix for vibrational transitions and the UK molecular R-matrix code. The interval of applicability of the rate coefficients is from 10 to 10,000 K. A comprehensive set of calculations is performed to assess uncertainty of the obtained data. The results should help in modelling non-LTE spectra of water in various astrophysical environments
Electron scattering on molecular nitrogen: common gas, uncommon cross sections
We discuss peculiar features of electron scattering on the N2 molecule and the N2+ ion, that are important for modeling plasmas, Earth’s and other planets’ atmospheres. These features are, among others: the resonant enhancement of the vibrational excitation in the region of the shape resonance around 2.4 eV, the resonant character of some of electronic excitation channels (and high values of these cross sections, both for triplet and singlet states), high cross section for the dissociation into neutrals, high cross sections for elastic scattering (and electronic transitions) on metastable states. For the N2+ ion we discuss both dissociation and the dissociative ionization, leading to the formation of atoms in excited states, and dissociative recombination which depends strongly on the initial vibrational state of the ion. We conclude that the theory became an indispensable completion of experiments, predicting many of partial cross sections and their physical features. We hope that the data presented will serve to improve models of nitrogen plasmas and atmospheres. Graphical abstract: [Figure not available: see fulltext.]
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