Single-particle aerosol online ionization source and realization method thereof

Abstract

This invention provides a article aerosol on-line ionization power, which is arranged outside the speeding area of the flying time quality analysis device, which includes ionization laser, low pressure radio frequency four poles, and the laser beam sent from the ionization laser is eradiated into the incenter of the low pressure radio frequency four poles vertically. The ionization power applying method has the following steps: measuring diameter of the single grain aerosol by aerodynamics, then before the flight time quality analyzer enters, iorizating the single grain into plasma, and the positive-negtive ions produced is focalized into ion beam which has very little spcace and then is sent into the flight time quality analyzer. And this invenktion also combining the ionization zone with the aerodynamics diameter measuring zone together, when diameter measuring is done, aerosol inoizates, which reduces the excursion distance of the aerosol, an improves transmission efficient greatly;and low-voltage radio-frequency quadrupole pole's concentrating effect improves the differentiate rate of the flight time quality analyzer.

Description

technical field [0001] The invention relates to an on-line measurement technology of aerosol particles, in particular to an on-line ionization source of a single-particle aerosol and a realization method thereof. Background technique [0002] The size and chemical composition of aerosols have a major impact on global climate, air quality, and ecological health. Single-particle aerosol online monitoring time-of-flight mass spectrometer (Aerosol Time-of-flightMass Spectrometer, ATOFMS) is a new technology developed in recent years, which can monitor the aerodynamic diameter of single-particle aerosol and its atmospheric pollution components online in real time. An important means to determine the formation and source of aerosols. The basic principle is to measure the diameter of aerosols by aerodynamic methods, and then ionize the aerosols. The ionized ions are detected by a mass spectrometer. For the specific aerodynamic method for measuring aerosol p...

AI Technical Summary

Problems solved by technology

This is because in the existing equipment, the ionization source (laser ionization source) is set in the time-of-flight mass analyzer, and the aerosol needs to enter the time-of-flight mass analyzer to be ionized, so its transmission distance is relatively long, thus The problem of low aerosol detection efficiency has arisen

At the same time, because the laser ionization directly occurs in the time-of-flight mass analyzer in the existing equipment, the ions produced by the ionization have a large initial kinetic energy dispersion, resulting in a low mass resolution of the time-of-flight mass analyzer, only about 500

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