Rotational excitation of formaldehyde by hydrogen molecules: ortho-H2CO at low temperature
نویسندگان
چکیده
منابع مشابه
Low-temperature Rate Constants for Rotational Excitation
The low-temperature rotational (de-) excitation of C3 (X 1 g ) by collisions with He ( S ) is studied using an ab initio potential energy surface (PES). This PES has been calculated using the singleand double-excitation coupledcluster approach with noniterative perturbational treatment of triple excitations [CCSD(T)] and the augmented correlation-consistent triplebasis set (aug-cc-pVTZ) with bo...
متن کاملRotational excitation of 20 levels of para-H2O by ortho-H2 (j2 = 1, 3, 5, 7) at high temperature
Aims. The objective is to obtain the best possible set of rotational (de)-excitation state-to-state and effective rate coefficients for temperatures up to 1500 K. State-to-state rate coefficients are presented among the 20 lowest levels of para-H2O with H2( j2 = 1) and Δ j2 = 0,+2, and among the 10 lowest levels of para-H2O with H2( j2 = 3) and Δ j2 = 0,−2. Methods. Calculations are performed w...
متن کاملRotational quenching of H2CO by molecular hydrogen: cross-sections, rates and pressure broadening
We compute the rotational quenching rates of the first 81 rotational levels of orthoand paraH2CO in collision with orthoand para-H2, for a temperature range of 10–300 K. We make use of the quantum close-coupling and coupled-state scattering methods combined with the high accuracy potential energy surface of Troscompt et al. Rates are significantly different from the scaled rates of H2CO in coll...
متن کاملRotational excitation of HD molecules by He atoms
We present rate coefficients for rotational transitions induced in collisions between HD and He. Rotational levels and kinetic temperatures T ≤ 1000 K are considered. The interaction potential surface calculated by Muchnick & Russek (1994) has been used, together with the quantal coupled-channel method for calculating the cross-sections. Very good agreement with previous calculations by Schaefe...
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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200810712