title: Dissociative electron attachment to gas-phase formamide.
abstract: Dissociative electron attachment (DEA) to gaseous formamide, HCONH(2), has been investigated in the energy range between 0 eV and 18 eV using a crossed electron/molecule beam technique. The negative ion fragments have been comprehensively monitored and assigned to molecular structures by comparison with the results for two differently deuterated derivatives, namely 1D-formamide, DCONH(2), and N,N,D-formamide, HCOND(2). The following products were observed: HCONH(-), CONH(2)(-), HCON(-), OCN(-), HCNH(-), CN(-), NH(2)(-)/O(-), NH(-), and H(-). NH(2)(-) was also separated from O(-) by using high-resolution negative ion mass spectrometry. Four resonant dissociation channels can be resolved, the strongest ones being located between 2.0 and 2.7 eV and between 6.0 and 7.0 eV. CN(-) as the most abundant fragment and HCONH(-) are the dominant products of the first of these two resonances. The most important products of the latter resonance are NH(2)(-), CN(-), H(-), CONH(2)(-), and OCN(-). It is thus found that the loss of neutral H is a site-selective process, dissociation from the N site taking place between 2.0 and 2.7 eV while dissociation from the C site occurs between 6.0 and 7.0 eV. The suitability of these reactions and thus of formamide as an agent for electron-induced surface functionalisation is discussed.
authors.affiliation: Universität Bremen, Institut für Angewandte und Physikalische Chemie, Fachbereich 2 (Chemie/Biologie), Bremen, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Hamann
authors.forename: A
authors.initials: A
authors.lastname: Edtbauer
authors.forename: F Ferreira
authors.initials: FF
authors.lastname: da Silva
authors.forename: S
authors.initials: S
authors.lastname: Denifl
authors.forename: P
authors.initials: P
authors.lastname: Scheier
authors.forename: P
authors.initials: P
authors.lastname: Swiderek