Dissociative thermal-electron attachment at a surface: CN- emission from nitrogen ion irradiated graphite

Authors
Citation
Zw. Deng et R. Souda, Dissociative thermal-electron attachment at a surface: CN- emission from nitrogen ion irradiated graphite, SURF SCI, 488(3), 2001, pp. 393-398
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
0039-6028 → ACNP
Volume
488
Issue
3
Year of publication
2001
Pages
393 - 398
Database
ISI
SICI code
0039-6028(20010810)488:3<393:DTAAAS>2.0.ZU;2-Q
Abstract
We report an observation of strong thermal-emission of CN- ions from nitrog en ion irradiated graphite surface. Careful monitoring of thermal desorptio n of both neutral and charged species demonstrates that the desorbed nitrog en-containing species is dominated by N-2 and C2N2 Molecules and emission o f CN- occurs as a consequence of dissociative thermal-electron attachment t o C2N2 molecules at the surface. An activation energy of 5.0 +/- 0.2 eV for ionization is derived from the temperature dependence of the CN yield whic h is related to the surface work function governing the surface thermal-ele ctron emission. (C) 2001 Elsevier Science B.V. All rights reserved.