Theories of Unimolecular Gas Reactions at Low Pressures

Rice, O. K.; Ramsperger, H. C.

doi:10.1021/ja01406a001

Cited by 432 publications

(230 citation statements)

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“…Garrod et al (2007) have used the theory of Rice-Ramsperger-Kessel (Rice & Ramsperger 1927, Kassel 1928, in which the probability of desorption is expressed as…”

Section: Computation Of Chemical Desorption Branching Ratiosmentioning

confidence: 99%

Binding energies: New values and impact on the efficiency of chemical desorption

Wakelam¹,

Loison

Méreau

et al. 2017

Molecular Astrophysics

205

250

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Recent laboratory measurements have confirmed that chemical desorption (desorption of products due to exothermic surface reactions) can be an efficient process. The impact of including this process into gas-grain chemical models entirely depends on the formalism used and the associated parameters. Among these parameters, binding energies are probably the most uncertain ones for the moment. We propose a new model to compute binding energy of species to water ice surfaces. We have also compared the model results using either the new chemical desorption model proposed by Minissale et al. (2016) or the one of Garrod et al. (2007). The new binding energies have a strong impact on the formation of complex organic molecules. In addition, the new chemical desorption model from Minissale produces a much smaller desorption of these species and also of methanol. Combining the two effects, the abundances of CH 3 OH and COMs observed in cold cores cannot be reproduced by astrochemical models anymore.

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“…Garrod et al (2007) have used the theory of Rice-Ramsperger-Kessel (Rice & Ramsperger 1927, Kassel 1928, in which the probability of desorption is expressed as…”

Section: Computation Of Chemical Desorption Branching Ratiosmentioning

confidence: 99%

Binding energies: New values and impact on the efficiency of chemical desorption

Wakelam¹,

Loison

Méreau

et al. 2017

Molecular Astrophysics

205

250

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“…Jochims et al (1999) designed the photostability index R in the framework of the Rice-Ramsperger-Kassel theory for unimolecular reaction rates (RRK theory; Rice & Ramsperger 1927;Kassel 1928). The index was introduced to examine the behavior of PAH derivatives with regard to fragmentation relative to that of the regular species.…”

Section: Photostabilitymentioning

confidence: 99%

Dissociative Photoionization of Polycyclic Aromatic Hydrocarbon Molecules Carrying an Ethynyl Group

Rouillé

Krasnokutski

Fulvio

et al. 2015

ApJ

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The life cycle of the population of interstellar polycyclic aromatic hydrocarbon (PAH) molecules depends partly on the photostability of the individual species. We have studied the dissociative photoionization of two ethynylsubstituted PAH species, namely, 9-ethynylphenanthrene and 1-ethynylpyrene. Their adiabatic ionization energy and the appearance energy of fragment ions have been measured with the photoelectron photoion coincidence spectroscopy technique. The adiabatic ionization energy has been found at 7.84 ± 0.02 eV for 9-ethynylphenanthrene and at 7.41 ± 0.02 eV for 1-ethynylpyrene. These values are similar to those determined for the corresponding non-substituted PAH molecules phenanthrene and pyrene. The appearance energy of the fragment ion indicative of the loss of a H atom following photoionization is also similar for either ethynyl-substituted PAH molecule and its non-substituted counterpart. The measurements are used to estimate the critical energy for the loss of a H atom by the PAH cations and the stability of ethynyl-substituted PAH molecules upon photoionization. We conclude that these PAH derivatives are as photostable as the non-substituted species in H I regions. If present in the interstellar medium, they may play an important role in the growth of interstellar PAH molecules.

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“…Cuatro libros excelentes acerca de las reacciones unimoleculares son los de Forst 14 , Robinson y Holbrook 15 , Gilbert y Smith 16 y Baer y Hase 17 . Estos importantes avances, tanto experimentales como teóricos, en el campo de las reacciones unimoleculares han conducido a la posibilidad de realizar tests críticos de las suposiciones básicas de las teorías estadísticas propuestas ya hace más de 70 años por Rice y Ramsperger [18][19][20] . Esta viene siendo en gran medida la actividad desarrollada en nuestro grupo de investigación durante los últimos años.…”

Section: Introductionunclassified

Dinámica de reacciones unimoleculares en fase gas: Desviaciones del comportamiento estadístico

Martı́nez-Núñez¹,

Vázquez²

2002

Quím. Nova

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Recebido em 26/3/01; aceito em 19/9/01 DYNAMICS OF UNIMOLECULAR REACTIONS IN GAS PHASE. DEVIATIONS FROM STATISTICAL BEHAVIOR. The present review summarizes the most relevant results of our research group obtained recently in the field of unimolecular reaction dynamics. The following processes are specifically analyzed: the isomerization, dissociation and elimination in methyl nitrite, the fragmentation reactions of the mercaptomethyl cation, the C-CO dissociation in the acetyl and propionyl radicals, and the decomposition of vinyl fluoride. In all the cases, only state-or energy-selected systems are considered. Special emphasis is paid to the possibility of systems exhibiting non-statistical behavior.

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Theories of Unimolecular Gas Reactions at Low Pressures

Cited by 432 publications

References 0 publications

Binding energies: New values and impact on the efficiency of chemical desorption

Binding energies: New values and impact on the efficiency of chemical desorption

Dissociative Photoionization of Polycyclic Aromatic Hydrocarbon Molecules Carrying an Ethynyl Group

Dinámica de reacciones unimoleculares en fase gas: Desviaciones del comportamiento estadístico

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