Laser-Enhanced Ionization in Microwave-Induced Plasmas

$29.00 plus tax (Refund Policy)

Buy Article:

Abstract:

Laser-Enhanced Ionization (LEI) signals have been detected for Na, Li, and Ba analytes in a microwave-induced plasma (MIP). A 300-mW continuous-wave (cw) dye laser pumped by a 5-W argon-ion laser was used to promote measurably increased ionization rates for these elements. A low-power, high-efficiency microwave plasma at 1 atmosphere with nitrogen and nitrogen-containing support gas was employed as the atom reservoir. The effects of varying applied microwave power, support gas composition, electrode voltage, and geometry were studied and results are given. The experimental variables that most significantly affect LEI signal intensity are: (1) electrode geometry, spacing, voltage, and distance above the cavity; (2) applied microwave power; (3) gas composition in an argon and nitrogen mixture; and (4) laser intensity. Experimental results are presented from the studies of Na LEI signals as a function of each one of these variables. Preliminary analytical studies yield Na detection limits in the low ng/mL range, showing this method to be competitive with other laser-based ionization methods.

Keywords: Atmospheric pressure nitrogen plasma; Laser-enhanced ionization; Microwave-induced plasma

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702894203561

Affiliations: 1: Chemistry Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061; present address: Digital Equipment Corporation, Four Results Way, MR04-2/C17, Marlboro, MA 01752 2: Chemistry Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

Publication date: September 1, 1989

More about this publication?
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more