If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Trace Detection of Nitrocompounds by ArF Laser Photofragmentation/Ionization Spectrometry

$29.00 plus tax (Refund Policy)

Buy Article:

Abstract:

A new method for detecting trace vapors of NO2-containing compounds near atmospheric conditions has been demonstrated with the use of one-color-laser photofragmentation/ionization spectrometry. An ArF laser is employed to both photolytically fragment the target molecules in a collision-free environment and ionize the characteristic NO fragments. The production of NO is hypothesized to result from a combination of two NO2 unimolecular fragmentation pathways, one yielding NO in its X 2Π electronic ground state and the other in its A 2Σ+ excited state. Ionization of ground-state NO molecules is accomplished by resonance-enhanced multiphoton ionization processes via its A 2Σ+X 2Π (3, 0), B 2Π ← X 2Π (7, 0) and/or D 2Σ+X 2Π (0, 1) bands at 193 nm. The analytical utility of this method is demonstrated in a molecular beam time-of-flight apparatus. Limits of detection range from the parts-per-million (ppm) to parts-per-billion (ppb) level for NO, NO2, CH3NO2, dimethylnitramine (DMNA), ortho- and meta-nitrotoluene, nitrobenzene, and trinitrotoluene (TNT). Under effusive beam experimental conditions, discrimination between structural isomers, ortho-nitrotoluene and meta-nitrotoluene, has been demonstrated with the use of their characteristic photofragmentation/ionization mass spectra.

Keywords: ArF excimer laser; NOx detection; Photofragmentation spectroscopy; Resonance-enhanced multiphoton ionization (REMPI)

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934066190

Affiliations: 1: U.S. Army Research Laboratory, AMSRL-WT-PC, Aberdeen Proving Ground, Maryland 21005-5066; NRC/NAS Postdoctoral Research Associate 2: U.S. Army Research Laboratory, AMSRL-WT-PC, Aberdeen Proving Ground, Maryland 21005-5066

Publication date: November 1, 1993

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