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China's self-developed ionized atmospheric nucleation aerosol mass spectrometer can analyze nanoparticle
[ Instrument Network Instrument Development ] Recently, six experts from the University of Science and Technology of China, China University of Geosciences, Nanjing University of Information Science and Technology and Anhui University developed a vacuum ultraviolet photoionization nucleating aerosol for Anhui Institute of Optics and Mechanics. Mass spectrometer project for technical testing and acceptance.
The vacuum ultraviolet photoionization sample of atmospheric nucleation aerosol mass spectrometer realizes atmospheric pressure mass spectrometry injection and high efficiency transmission of ultrafine nano particles, and the chemical composition of ultrafine nano particles is obtained from on-line detection at the molecular level, and vacuum is carried out. Preliminary application research of ultraviolet photoionization nucleation aerosol mass spectrometer. The expert group agreed that the project met the acceptance criteria.
Aerosol mass spectrometer
Suspended particulate matter or aerosols in the atmosphere have profound effects on air quality, regional, global climate change, and human health. Matrix-assisted laser desorption/ionization is a soft ionization technique for the analysis and detection of biological macromolecules. Soft ionization means that in mass spectrometry, an ion source dissociates a molecule into ions or dissociates into fragments, where molecules lose electrons and generate positively charged molecular ions. The molecular ions can be further cleaved to produce smaller mass fragments.
Vacuum ultraviolet photoionization mass spectrometry
Neutral sample molecules are introduced into a high vacuum ionization chamber where the sample molecules are subjected to vacuum ultraviolet photoionization at a tunable wavelength and mass spectra are detected by a time-of-flight mass spectrometer. Analyze the composition of complex mixtures. The research team of the Chinese Academy of Sciences independently developed a new type of iontophoreser, and further developed vacuum ultraviolet photoionization mass spectrometry technology to achieve high-sensitivity mass spectrometry detection of free radicals in the flow reaction system. Synchrotron radiation was used as an ionization source, and freedom was achieved by vacuum ultraviolet photoionization mass spectrometry. The comprehensive detection of the base reaction species and the efficient separation of the isomers using the photoionization efficiency spectrum.
Nanoparticle
Also known as nano dust, nano dust, refers to microscopic particles of the nanometer scale. It is defined as particles that are less than 100 nanometers in at least one dimension. Semiconductor nanoparticles smaller than 10 nm are also called quantum dots due to their electronic energy level quantization.
Atmospheric aerosol nucleation
Atmospheric nucleation is the main source of atmospheric aerosol particles in the world and plays an important role in the aerosol climate effect. The key steps in the atmospheric nucleation process occur in the size range below 2 nm. A molecular cluster of less than 2.5 nm is formed, that is, a nucleation stage of generating a critical core. With basic structural information, chemical composition analysis uses instruments such as photoelectron spectroscopy and infrared spectroscopy.