FIELD: physics; instrumentation.
SUBSTANCE: invention relates to ion-drift and mass spectrometry and will find a wide application when solving analytical tasks in organic and bioorganic chemistry, immunology, biotechnology, forensics, proteomics when investigating labile substances using the "electrospray" method. Device of stable electro-spraying solutions of substances at atmospheric pressure for ion sources is configured as a metallic capillary to feed the solution. At the end of that capillary a liquid meniscus is formed, from which there is an emission of charged particles made under the effect of electric voltage supplied to the counter electrode. Outside the metallic capillary there is a coaxial nozzle from a chemically stable, non-wettable, non-porous dielectric material. End of the nozzle on the side of the meniscus has the shape of a truncated cone with the section diameter and the inner channel both equal to two diameters of the capillary, onto which the meniscus rests. Inner channel is located along the axis of the straight truncated cone and has a variable cross-section, the length of the inner channel in its narrow part is equal to the diameter of the cone section and makes five its diameters. Inner channel in its wide part features a diameter much larger than that in its narrow part. Cone vertex has an angle of not more than 90 degrees. Flat counter electrode is electrically connected to a high-voltage power supply source, and the metallic capillary is grounded. Coaxial gap between the capillary and the nozzle is connected to an air extraction pump to eliminate excess non-sprayed solution together with the laboratory air.
EFFECT: longer stable mode of electro-spraying solutions of substances at atmospheric pressure for ion sources, reduced noise in the recorded spectra, absence of false peaks in the spectra due to electrochemical erosion, increased electric strength of the electro-spraying unit for breakdowns.
1 cl, 4 dwg
