Ion trap mass analyzer based infrared light dissociation spectrograph

Abstract

The invention discloses an infrared photodissociation spectrometer based on an ion trap mass analyzer. An ion detector and an infrared laser system are provided, and the transmission line, octopole, hexapole, and low-temperature linear ion trap are set in a four-stage differential pumping vacuum system; the electrospray device is used as an ionization source, and the neutral The substance is ionized into ions, and then transmitted to the low temperature linear ion trap through the transmission line, octopole and hexapole. The low temperature linear ion trap is used as a mass analysis device. The infrared light output by the infrared laser system is incident on the low temperature linear ion trap. Complete ionization, ion cooling, ion selection, infrared photodissociation, mass analysis and emptying in a low temperature linear ion trap. The invention has the characteristics of miniaturization, low price, easy maintenance, good stability, high sensitivity and resolution.

Description

technical field [0001] The invention designs an infrared photodissociation spectrometer, in particular relates to an infrared photodissociation spectrometer based on an ion trap mass analyzer, and belongs to the technical field of analytical instruments. technical background [0002] Infrared photodissociation spectroscopy is very sensitive and mass selective, providing vibrational spectra of ionic compounds in the gas phase. With the development of tuned infrared lasers, infrared photodissociation spectroscopy has become an effective method to study the infrared vibrational spectra of gas-phase ions and clusters. Mass spectrometry is used to select the mass of ions, and the selected ions interact with a tunable infrared laser to undergo photodissociation, and the infrared spectrum is obtained according to the signal of the dissociated fragments as the wavelength of the infrared laser changes. Infrared photodissociation mass spectrometry is very sensitive, using detectors t...

AI Technical Summary

Problems solved by technology

This infrared photodissociation spectrometer based on time-of-flight mass spectrometry has a vacuum flight pipeline as long as two meters, a complex structure and a large volume, extremely high requirements for vacuum, and a relatively cumbersome vacuum design.

In addition, the pulsed infrared laser light source commonly used in the laboratory is mainly the free electron laser, but its device is relatively complicated, and the laser system is very large. Currently, only a few large-scale laboratories can be equipped with it.

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