Results 201 to 210 of about 37,547 (266)

Micro flame ionization detector and micro flame spectrometer

Sensors and Actuators B: Chemical, 2000
Abstract In this paper we present a miniaturized flame ionization detector and flame spectrometer fabricated using conventional micromachining technologies. The main component of both devices is a micro burner unit, which uses minimal oxyhydrogen to produce a stable miniature flame.
S Zimmermann, S Wischhusen, J Müller
exaly   +2 more sources

Flame ionization detectors

Journal of Chromatography A, 1963
Abstract Methods are described for improving the performance of the amplifiers associated with the diode and triode flame ionization detectors. The effect of these amplifiers on linearity, time constant and drift rate is discussed together with the theoretical and practical limitations of detection.
J, MIDDLEHURST, B, KENNETT
openaire   +2 more sources

Ionization in flames: current-voltage relationships for the flame ionization detector

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1971
Abstract An analysis is made of the ionization current drawn from a flame ionization detector having cylindrical symmetry. An idealized representation of the flame is used which enables a relation to be defined between the applied voltage and the current drawn from the flame, and the expression contains factors dependent on geometry ...
H. C. Bolton, I. G. McWilliam
openaire   +1 more source

Ionization of nitromethane in the flame ionization detector

Canadian Journal of Chemistry, 1981
The mass spectra observed on sampling the unburnt gases of a flame ionization detector to which nitromethane has been added are due mostly to proton transfer reactions of NH4+ and H3O+. These are formed in the reaction zone from the primary ion HCO+, and pass through the unburnt gases to the sampling orifice.
T. McAllister, A. J. C. Nicholson, J. D. Scott   +2 more
openaire   +1 more source

Ionization in Hydrocarbon Flames

Nature, 1966
WE wish to comment on an omission of generality in the interpretation of data obtained by Green and Sugden1 concerning ionization in flames which contain hydrocarbons. These data form the quantitative basis for the reaction which is usually accepted to be responsible for CHO+ in ...
R. F. KLEMM, A. T. BLADES
openaire   +1 more source

Ionization Flame Detectors

Review of Scientific Instruments, 1949
Two new ionization methods of detecting flames are described for use in the measurement of flame speeds. In one the loading characteristics of a high frequency oscillator are utilized by causing the flame to pass through an oscillator tank coil. The second method employs the flame conductivity by placing two ring electrodes around the exterior of a ...
openaire   +2 more sources

Ionization in Carbon Monoxide Flames

Nature, 1970
IT is now generally believed that ionization in hydrocarbon flames results chiefly from a chemi-ionization process involving the ...
openaire   +2 more sources

Laser-enhanced flame ionization detector

Applied Optics, 1987
A laser-enhanced flame ionization detector is proposed which promises to retain the desirable properties of conventional flame ionization detectors while providing significantly lower detection limits. Experiments are described which demonstrate laser enhancement of the flame ionization detector response.
T A, Cool, J E, Goldsmith
openaire   +2 more sources

Ionization in flames. II. Mass-spectrometric and mobility analyses for the flame ionization detector ||

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1978
Abstract An earlier paper by two of the present authors gave an electrical theory of the flame ionization detector. Results of mass spectrometric and mobility studies of the positive ion species in the detector are presented here. For all organic additives, at concentrations around 1 %, the charge is carried by a group of ions, H 30 ...
H. C. Bolton, Janine Grant, I. G. McWilliam, A. J. C. Nicholson, D. L. Swingler   +4 more
openaire   +1 more source

Ionization in a methanol-oxygen flame

International Journal of Mass Spectrometry and Ion Physics, 1979
Abstract The combustion of methanol was studied in a conical methanol—oxygen flame of fuel-lean composition (equivalence ratio φ = 0.25) burning at atmospheric pressure surrounded by a flowing argon shield. Oxygen bubbled through liquid methanol contained in two gas saturators provided a premixed flame of excellent stability and reproducibility.
J.M. Goodings, Chun-Wai Ng, D.K. Bohme
openaire   +1 more source