Direct measurement of thermal rate constants for state-to-state rotational energy transfer in collisions of CN(X 2Σ+, v=2, N) with He

Fei, R.; Lambert, Henry; Carrington, Tucker; Filseth, S.V.; Sadowski, C.M.; Dugan, C. H.

doi:10.1063/1.466649

Cited by 45 publications

(26 citation statements)

References 40 publications

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“…CN-He rate coefficients obtained from this PES were found to be in excellent agreement with the experimental rotational (with unresolved fine and hyperfine structure) rate coefficients of Fei et al (1994). This agreement demonstrate the accuracy of the PES and suggests that the rate coefficients obtained from this potential will be accurate enough to allow for improved astrophysical modelling of the ISM.…”

Section: Appendix A: Inelastic Rate Coefficients For the Cn Isotopolosupporting

confidence: 70%

Nitrogen isotopic ratios in Barnard 1: a consistent study of the N₂H⁺, NH₃, CN, HCN, and HNC isotopologues

Daniel

Gérin

Roueff

et al. 2013

A&A

106

150

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Context. The15 N isotopologue abundance ratio measured today in different bodies of the solar system is thought to be connected to 15 N-fractionation effects that would have occurred in the protosolar nebula. Aims. The present study aims at putting constraints on the degree of 15 N-fractionation that occurs during the prestellar phase, through observations of D, 13 C, and 15 N-substituted isotopologues towards B1b. Molecules both from the nitrogen hydride family, i.e. N 2 H + , and NH 3 , and from the nitrile family, i.e. HCN, HNC, and CN, are considered in the analysis. Methods. As a first step, we modelled the continuum emission in order to derive the physical structure of the cloud, i.e. gas temperature and H 2 density. These parameters were subsequently used as input in a non-local radiative transfer model to infer the radial abundance profiles of the various molecules. Results. Our modelling shows that all the molecules are affected by depletion onto dust grains in the region that encompasses the B1-bS and B1-bN cores. While high levels of deuterium fractionation are derived, we conclude that no fractionation occurs in the case of the nitrogen chemistry. Independently of the chemical family, the molecular abundances are consistent with 14 N/ 15 N ∼ 300, a value representative of the elemental atomic abundances of the parental gas. Conclusions. The inefficiency of the 15 N-fractionation effects in the B1b region can be linked to the relatively high gas temperature ∼17 K, which is representative of the innermost part of the cloud. Since this region shows signs of depletion onto dust grains, we cannot exclude the possibility that the molecules were previously enriched in 15 N, earlier in the B1b history and that such an enrichment could have been incorporated into the ice mantles. It is thus necessary to repeat this kind of study in colder sources to test such a possibility.

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Section: Appendix A: Inelastic Rate Coefficients For the Cn Isotopolosupporting

confidence: 70%

Nitrogen isotopic ratios in Barnard 1: a consistent study of the N₂H⁺, NH₃, CN, HCN, and HNC isotopologues

Daniel

Gérin

Roueff

et al. 2013

A&A

106

150

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“…Andresen et al observed this interference first in experiments on Ar-NO(X) collisions. 30,31 Similar structure also appears in later data on NO(X), 32,33 NO(A), 32 CN(X), 34 and CN(A) [35][36][37] collisions. The interference oscillations do not change rapidly as the collision energy changes, so they are fairly robust toward experimental averages over collision energy.…”

Section: Introductionsupporting

confidence: 56%

State to state He–CO rotationally inelastic scattering

Antonova

Lin

Tsakotellis

et al. 1999

The Journal of Chemical Physics

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Relative integral cross sections for rotational excitation of CO in collisions with He were measured at energies of 72 and 89 meV. The cross sections are sensitive to anisotropy in the repulsive wall of the He-CO interaction. The experiments were done in crossed molecular beams with resonance enhanced multiphoton ionization detection. The observed cross sections display interference structure at low ⌬ j, despite the average over the initial CO rotational distribution. At higher ⌬ j, the cross sections decrease smoothly. The results are compared with cross sections calculated from two high quality potential energy surfaces for the He-CO interaction.

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“…Collisions of these Σ molecular electronic states require only a single potential energy surface (PES) to describe the interaction with a collision partner. Fei et al 5,6 have employed stimulated emission pumping to prepare specific initial rotational levels in the CN(X 2 Σ + , V ) 2) vibrational manifold in studies of rotational energy transfer in collisions with He and Ar. Smith and co-workers [7][8][9] have employed IR-visible double resonance to determine total removal and state-to-state rate constants for collisions of selected CN(X 2 Σ + , V ) 2) rotational levels with N 2 and C 2 H 2 .…”

Section: Introductionmentioning

confidence: 99%

Rotationally Inelastic Collisions of CN(A²Π) with Small Molecules

Khachatrian

Dagdigian

2009

J. Phys. Chem. A

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An optical-optical double resonance technique has been utilized to investigate rotational energy transfer of selected rotational/fine-structure levels of CN(A(2)Pi, v = 3) in collisions with the molecular partners CO(2) and CH(4). Total removal rate constants for several rotational/fine-structure levels were measured for both collision partners. State-to-state relative rate constants were determined for several initial levels. These show a strikingly strong collisional propensity to conserve the fine-structure/Lambda-doublet label, akin to our previous observations with the N(2) collision partner. The possible origin of this propensity is discussed.

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Direct measurement of thermal rate constants for state-to-state rotational energy transfer in collisions of CN(X 2Σ+, v=2, N) with He

Cited by 45 publications

References 40 publications

Nitrogen isotopic ratios in Barnard 1: a consistent study of the N₂H⁺, NH₃, CN, HCN, and HNC isotopologues

Nitrogen isotopic ratios in Barnard 1: a consistent study of the N₂H⁺, NH₃, CN, HCN, and HNC isotopologues

State to state He–CO rotationally inelastic scattering

Rotationally Inelastic Collisions of CN(A²Π) with Small Molecules

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Direct measurement of thermal rate constants for state-to-state rotational energy transfer in collisions of CN(X 2Σ+, v=2, N) with He

Cited by 45 publications

References 40 publications

Nitrogen isotopic ratios in Barnard 1: a consistent study of the N2H+, NH3, CN, HCN, and HNC isotopologues

Nitrogen isotopic ratios in Barnard 1: a consistent study of the N2H+, NH3, CN, HCN, and HNC isotopologues

State to state He–CO rotationally inelastic scattering

Rotationally Inelastic Collisions of CN(A2Π) with Small Molecules

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Nitrogen isotopic ratios in Barnard 1: a consistent study of the N₂H⁺, NH₃, CN, HCN, and HNC isotopologues

Nitrogen isotopic ratios in Barnard 1: a consistent study of the N₂H⁺, NH₃, CN, HCN, and HNC isotopologues

Rotationally Inelastic Collisions of CN(A²Π) with Small Molecules