Negative ion formation in potassium-nitromethane collisions

被引：39

作者：

Antunes, R. ^{[1
]}

Almeida, D. ^{[1
]}

Martins, G. ^{[1
]}

Mason, N. J. ^{[2
]}

Garcia, G. ^{[3
,4
]}

Maneira, M. J. P. ^{[1
]}

Nunes, Y. ^{[1
]}

Limao-Vieira, P. ^{[1
,2
]}

机构：

[1] Univ Nova Lisboa, CEFITEC, FCT, Dept Fis,Lab Colisoes Atom & Mol, P-2829516 Caparica, Portugal

[2] Open Univ, Dept Phys & Astron, Ctr Earth Planetary Space & Astron Res, Milton Keynes MK7 6AA, Bucks, England

[3] CSIC, Inst Fis Fundamental, Madrid 28006, Spain

[4] Univ Nacl Educ Distancia, Dept Fis Mat, Madrid 28040, Spain

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 39期

关键词：

DISSOCIATIVE ELECTRON-ATTACHMENT; CH3NO2; DIPOLE; IMPACT; STATES; ANION; ATOMS;

D O I：

10.1039/c004467a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ion-pair formation in gaseous nitromethane (CH3NO2) induced by electron transfer has been studied by investigating the products of collisions between fast potassium atoms and nitromethane molecules using a crossed molecular-beam technique. The negative ions formed in such collisions were analysed using time-of-flight mass spectroscopy. The six most dominant product anions are NO2-, O-, CH3NO2-, OH-, CH2NO2- and CNO-. By using nitromethane-d(3) (CD3NO2), we found that previous mass 17 amu assignment to O- delayed fragment, is in the present experiment may be unambiguously assigned to OH-. The formation of CH2NO2- may be explained in terms of dissociative electron attachment to highly vibrationally excited molecules.

引用

页码：12513 / 12519

页数：7

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