منابع مشابه
Rotational excitation of the interstellar NH2 radical by H2.
We present quantum close-coupling calculations for the rotational excitation of the interstellar amidogen radical NH2 due to collisions with H2 molecules. The calculations are based on a recent, high-accuracy full-dimensional NH4 potential energy surface adapted for rigid-rotor scattering calculations. The collisional cross section calculations are performed for all transitions among the first ...
متن کاملState resolved rotational excitation cross sections and rates in H2+H2 collisions
Rotational transitions in molecular hydrogen collisions are computed. The two most recently developed potential energy surfaces for the H2−H2 system are used from the following works: 1) A.I. Boothroyd, P.G. Martin, W.J. Keogh, M.J. Peterson, J. Chem. Phys., 116 (2002) 666, and 2) P. Diep, J.K. Johnson, J. Chem. Phys., 113 (2000) 3480; ibid. 112, 4465. Cross sections for rotational transitions ...
متن کاملHyperfine excitation of linear molecules by para- and ortho-H2: application to the HCl-H2 system.
The determination of hyperfine structure resolved excitation cross sections and rate coefficients due to H2 collisions is required to interpret astronomical spectra. In this paper, we present several theoretical approaches to compute these data. An almost exact recoupling approach and approximate sudden methods are presented. We apply these different approaches to the HCl-H2 collisional system ...
متن کاملRotational excitation of HDO and D2O by H2: experimental and theoretical differential cross-sections.
We present state-to-state differential cross sections (DCSs) for rotationally inelastic scattering of HDO by normal- and para-H(2) at collision energies of 580 cm(-1) and 440 cm(-1). (2+1) resonance enhanced multiphoton ionization is used to detect rotationally cold HDO molecules before collision and as scattering products, which occupy higher rotational states due to collision with H(2). Relat...
متن کاملInfluence of a new potential energy surface on the rotational (de)excitation of H2O by H2 at low temperature
Aims. Using a newly determined 5D potential energy surface for H2–H2O we provide an extended and revised set of rate coefficients for de-excitation of the lowest 10 paraand 10 orthorotational levels of H2O by collisions with para-( j = 0) and ortho-H2( j = 1), for kinetic temperatures from 5 K to 20 K. Methods. Our close coupling scattering calculations involve a slightly improved set of couple...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1998
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.1998.01531.x