Abstract

Negative ion mass spectra organic nitriles have been determined using 1 Torr of methane moderator/reagent gas in a chemical ionization source. The spectra contain abundant (<i>M</i> – 1)⁻ ions, and fragmentations are minimal. Ion/molecule reactions with residual oxygen, methane, and between sample molecules and ions form diverse products with low abundances relative to the (<i>M</i> – 1)⁻. Detection limits are comparable with positive ion methods, and for selected compounds, can be several orders of magnitude lower.

Chemical ionization Fourier transform mass spectrometry of chemical warfare agent simulants using laser-produced metal ions

Chih-Cong Chou and S. Randolph Long
Appl. Opt. 29(33) 4981-4986 (1990)

Ultrasensitive detection of atmospheric constituents by supersonic molecular beam, multiphoton ionization, mass spectroscopy

Jack A. Syage, James E. Pollard, and Ronald B. Cohen
Appl. Opt. 26(17) 3516-3520 (1987)

Mass spectrometry of ion-induced water clusters: an explanation of the infrared continuum absorption

Hugh R. Carlon and Charles S. Harden
Appl. Opt. 19(11) 1776-1786 (1980)

Regularities of negative-ion resonances

Charles W. Clark and Stephen J. Buckman
J. Opt. Soc. Am. B 4(5) 815-820 (1987)

Organic Analysis

K. Biemann
Appl. Opt. 9(6) 1282-1288 (1970)