Experimental studies of the dissociative recombination of CD3CDOD+ and CH3CH2OH2+


Autoria(s): Hamberg, M; Zhaunerchyk, V; Vigren, E; Kaminska, M; Kashperka, I; Zhang, M; Trippel, S; Osterdahl, F; af Ugglas, M; Thomas, RD; Kallberg, A; Simonsson, A; Paal, A; Semaniak, J; Larsson, M; Geppert, WD
Data(s)

2010

Resumo

Aims. We determine branching fractions, cross sections and thermal rate constants for the dissociative recombination of CD3CDOD+ and CH3CH2OH2+ at the low relative kinetic energies encountered in the interstellar medium. Methods. The experiments were carried out by merging an ion and electron beam at the heavy ion storage ring CRYRING, Stockholm, Sweden. Results. Break-up of the CCO structure into three heavy fragments is not found for either of the ions. Instead the CCO structure is retained in 23 +/- 3% of the DR reactions of CD3CDOD+ and 7 +/- 3% in the DR of CH3CH2OH2+, whereas rupture into two heavy fragments occurs in 77 +/- 3% and 93 +/- 3% of the DR events of the respective ions. The measured cross sections were fitted between 1-200 meV yielding the following thermal rate constants and cross-section dependencies on the relative kinetic energy: sigma(E-cm[eV]) = 1.7 +/- 0.3 x 10(-15)(Ecm[eV])(-1.23 +/- 0.02) cm(2) and k(T) = 1.9 +/- 0.4 x 10(-6)(T/300)-0.73 +/- 0.02 cm(3) s(-1) for CH3CH2OH2+ as well as k(T) = 1.1 +/- 0.4 x 10(-6)(T/300)(-0.74 +/- 0.05) cm(3) s(-1) and s(Ecm[eV]) = 9.2 +/- 4 x 10(-16)(Ecm[eV])-1.24 +/- 0.05 cm(2) for CD3CDOD+

Identificador

http://ir.impcas.ac.cn/handle/113462/8283

http://www.irgrid.ac.cn/handle/1471x/133218

Idioma(s)

英语

Fonte

Hamberg, M; Zhaunerchyk, V; Vigren, E; Kaminska, M; Kashperka, I; Zhang, M; Trippel, S; Osterdahl, F; af Ugglas, M; Thomas, RD; Kallberg, A; Simonsson, A; Paal, A; Semaniak, J; Larsson, M; Geppert, WD.Experimental studies of the dissociative recombination of CD3CDOD+ and CH3CH2OH2+,ASTRONOMY & ASTROPHYSICS,2010,522():A90

Palavras-Chave #ABSOLUTE CROSS-SECTIONS #BRANCHING RATIOS #MOLECULAR-IONS #INTERSTELLAR CLOUDS #PROTONATED ETHANOL #HIGH-RESOLUTION #H3O+ #CHEMISTRY #COEFFICIENTS #ASSOCIATION
Tipo

期刊论文