English español
Search
 

Repositorio de la Universidad de Oviedo. > Producción Bibliográfica de UniOvi: RECOPILA > Artículos >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/8493

Title: Investigation of the afterglow time regime in pulsed radiofrequency glow discharge time-of-flight mass spectrometry
Author(s): González Gago, Cristina
Bordel García, Nerea
Pereiro García, María Rosario
Sanz Medel, Alfredo
Keywords: Glow Discharge; Mass Spectrometry; Ionization Mechanisms; Afterglow; Pulsed Operation Mode
Issue date: 2011
Publisher version: http://dx.doi.org/10.1002/jms.1956
Citation: Journal of Mass Spectrometry, 46(8), p. 757-763 (2011); doi:10.1002/jms.1956
Format extent: p. 757-763
Abstract: The pulsed power operation mode of a radiofrequency (rf) glow discharge time-of-flight mass spectrometer was investigated, for several ions, in terms of intensity profiles along each pulse period. Particular attention was paid to the plateau and transient afterglow regions. An rf pulse period of 4 ms and a duty cycle of 50% was selected to evaluate the influence of discharge parameters in the afterglow delay and shape of Ar+, Ar2+ and several analytes (Br, Cl, Cu) contained in polymeric layers. Pulse shapes of Ar+ and Ar2+ ions vary with pressure and power. At low pressures the highest intensity is observed in the plateau while at higher pressures (>600 Pa) the afterpeak is the dominant region. Although the influence of the applied power is less noticeable, a widening of the afterglow time regime occurs for Ar+ when increasing the power. Maximum intensity of the argon signal is measured in the afterglow at 30 W, while the area of such afterpeak increases with power. The maximum intensity of Ar2+ is obtained at the highest power employed (60 W) and the ratio maximum intensity/afterglow area remains approximately constant with power. Analytes with ionization potentials below (Cu) or just above (Br) the argon metastable energy show maxima intensities after argon ions decay, indicating they could be ionized by collisions with metastable Ar atoms. Chlorine signals are observed in the afterglow despite their ionization potential is well above the energy of argon metastable levels. Moreover, they follow a similar pattern to that observed for Ar2+, indicating that charge-transfer process with Ar2+ could play a significant role. Copyright © 2011 John Wiley & Sons, Ltd.
URI: http://hdl.handle.net/10651/8493
ISSN: 1076-5174
Local identifier: 20110917
Appears in Collections:Artículos

Files in This Item:

There are no files associated with this item.



Exportar a Mendeley


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Base de Datos de Autoridades Biblioteca Universitaria Consultas / Sugerencias