Kinetic investigation of reactions of atomic carbon, C[2p2(3PJ)], with simple nitrogen-containing molecules and aromatic heterocyclic compounds

Deeyamulla, M.P.; Husain, D.

doi:10.1016/j.jphotochem.2006.05.030

Cited by 3 publications

(8 citation statements)

References 56 publications

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“…The results show, however, that the nature of the carrier gas does not influence the reaction rate, indicating the negligible role of complex/adduct stabilization in the C + NH 3 system; in good agreement with the conclusions of paper I. Nevertheless, the high values of the rate constant obtained in the present work are in stark contrast with the low value obtained by earlier experiments at 300 K (Deeyamulla & Husain 2007). These authors employed a time resolved atomic resonance absorption method to study the kinetics of the C + NH 3 reaction.…”

Section: Resultssupporting

confidence: 91%

“…Although the theoretical results show that H 2 CN + H, HCN + H + H and HNC + H + H are all possible exothermic product channels, experimental studies of the H 2 CN + H channel performed at the Advanced Light Source at 330 K coupled with measurements of the H atom product yields undertaken using the Laval nozzle technique down to 50 K clearly indicate that the H 2 CN + H channel dominates at 300 K and below. As the electronic structure calculations suggest that the C( 3 P) + NH 3 reaction proceeds over a barrierless potential energy surface leading to products, this process could also be rapid at room temperature and below despite previous findings to the contrary (Deeyamulla & Husain 2007).…”

Section: Introductionmentioning

confidence: 84%

“…In article I, we investigated product formation by the reaction of ground state atomic carbon surface leading to products, this process could also be rapid at room temperature and below despite previous findings to the contrary (Deeyamulla & Husain 2007).…”

Section: Introductionmentioning

confidence: 99%

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THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH₂, AND NH₃ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

Hickson

Loison

Bourgalais

et al. 2015

ApJ

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A continuous supersonic flow reactor has been used to measure rate constants for the C( 3 P) + NH 3 reaction over the temperature range 50-296 K. C( 3 P) atoms were created by the pulsed laser photolysis of CBr 4 . The kinetics of the title reaction were followed directly by vacuum ultraviolet laser induced fluorescence (VUV LIF) of C( 3 P) loss and through H( 2 S) formation. The experiments show unambiguously that the reaction is rapid at 296 K, becoming faster at lower temperatures, reaching a value of (1.8 ± 0.2) ⋅ 10 -10 cm 3 molecule -1 s -1 at 50 K. As this reaction is not currently included in astrochemical networks, its influence on interstellar nitrogen hydride abundances is tested through a dense cloud model including gas-grain interactions. In particular, the effect of the ortho-to-para ratio of H 2 which plays a crucial role in interstellar NH 3 synthesis is examined.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 84%

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THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH₂, AND NH₃ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

Hickson

Loison

Bourgalais

et al. 2015

ApJ

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“…As demonstrated in part II of this work, the C( 3 P) + NH 3 reaction is fast at room temperature and below, despite previous measurements to the contrary (Deeyamulla & Husain 2007). The title reaction is very likely to influence the chemistry of nitrogen hydrides, NH 3 , NH 2 and NH, and more generally to affect nitrogen chemistry in the interstellar medium.…”

Section: Notementioning

confidence: 56%

THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. I. INVESTIGATION OF THE PRODUCT FORMATION CHANNELS

Bourgalais

Capron

Kailasanathan

et al. 2015

ApJ

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The product formation channels of ground state carbon atoms, C( 3 P), reacting with ammonia, NH 3 , have been investigated using two complementary experiments and electronic structure calculations. Reaction products are detected in a gas flow tube experiment (330 K, 4 Torr) using tunable vacuum-ultraviolet (VUV) photoionization coupled with time of flight mass spectrometry. Temporal profiles of the species formed and photoionization spectra are used to identify primary products of the C + NH 3 reaction. In addition, H-atom formation is monitored by VUV laser induced fluorescence (LIF) from room temperature to 50 K in a supersonic gas flow generated by the Laval nozzle technique. Electronic structure calculations are performed to derive intermediates, transition states, and complexes formed along the reaction coordinate. The combination of photoionization and LIF experiments supported by theoretical calculations indicate that in the temperature and pressure range investigated, the H + H 2 CN production channel represents 100% of the product yield for this reaction. Kinetics measurements of the title reaction down to 50 K and the effect of the new rate constants on interstellar nitrogen hydride abundances using a model of dense interstellar clouds are reported in Paper II.

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“…12 NH 3 has been known to exist in the interstellar medium for a long time, 13 but its reaction with ground state carbon appears to be slow according to its upper bound estimate. 14 Although P is a moderately abundant element in the space, 15 not many P-containing compounds have been detected so far. The PN molecule has been detected rather long ago in several sources.…”

Section: Introductionmentioning

confidence: 99%

The dynamics of the C + PH3 reaction: A theoretical study

Rey-Villaverde

Álvarez‐Barcia

Flores

2012

The Journal of Chemical Physics

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The C + PH(3) reaction is one of the simplest gas-phase processes which can produce molecular species containing P-C bonds. It could be of astrophysical importance and a reference for other phosphine reactions with carbon-containing molecular radicals. The dynamical aspects have been studied theoretically by quasi-classical trajectory methods in order to determine its rate as a function of the temperature, the branching ratios, and the molecular mechanisms. We have obtained a T(0.2) dependence of the capture rate. The total rate is affected by the existence of relatively high-lying saddle points for the isomerization of the CPH(3) complex but get a value of 0.82·10(-10) cm(3) s(-1) at 300 K, which is considered quite high for a neutral-neutral reaction and higher than those of similar reactions. Moreover, the total rate presents a weak dependence with the temperature. Our results indicate that several products containing P-C bonds are formed, the main reaction channel being the generation of HPCH + H.

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Kinetic investigation of reactions of atomic carbon, C[2p2(3PJ)], with simple nitrogen-containing molecules and aromatic heterocyclic compounds

Cited by 3 publications

References 56 publications

THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH₂, AND NH₃ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH₂, AND NH₃ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. I. INVESTIGATION OF THE PRODUCT FORMATION CHANNELS

The dynamics of the C + PH3 reaction: A theoretical study

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Kinetic investigation of reactions of atomic carbon, C[2p2(3PJ)], with simple nitrogen-containing molecules and aromatic heterocyclic compounds

Cited by 3 publications

References 56 publications

THE C(3P) + NH3REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH2, AND NH3ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

THE C(3P) + NH3REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH2, AND NH3ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

THE C(3P) + NH3REACTION IN INTERSTELLAR CHEMISTRY. I. INVESTIGATION OF THE PRODUCT FORMATION CHANNELS

The dynamics of the C + PH3 reaction: A theoretical study

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Product

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THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH₂, AND NH₃ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. II. LOW TEMPERATURE RATE CONSTANTS AND MODELING OF NH, NH₂, AND NH₃ABUNDANCES IN DENSE INTERSTELLAR CLOUDS

THE C(³P) + NH₃REACTION IN INTERSTELLAR CHEMISTRY. I. INVESTIGATION OF THE PRODUCT FORMATION CHANNELS