Related Experiment Videos
Electric field assisted thermal desorption ionization using an infrared laser
1Faculty of Engineering, Yamanashi University, Takeda-4, Kofu 400, Japan.
Rapid Communications in Mass Spectrometry : RCM
|November 24, 1999
Summary
A novel method uses electric fields and laser heating to create gas-phase ions from solid samples at atmospheric pressure. This technique efficiently generates various ions, including multiply charged species, for potential analytical applications.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
- Materials Science
Background:
- Ion formation is crucial for mass spectrometry and chemical analysis.
- Existing methods often require vacuum conditions, limiting sample types and applications.
- Atmospheric pressure ionization techniques offer advantages in speed and sample handling.
Purpose of the Study:
- To develop a new technique for generating gas-phase ions at atmospheric pressure.
- To investigate the efficiency of electric field assisted thermal desorption ionization.
- To characterize the types of ions produced from solid samples.
Main Methods:
- Utilized a sharp tungsten wire tip coated with a solid sample film.
- Employed a 10.6 µm infrared laser for sample irradiation.
- Applied a strong electric field to the laser-irradiated tip to facilitate ionization.
Main Results:
- Successfully generated abundant gas-phase electrons and ions.
- Observed the formation of various ions, including alkali and halide ions.
- Detected multiply charged negative ions, such as S(2)O(6)(2-) and S(2)O(8)(2-).
Conclusions:
- Electric field assisted thermal desorption ionization is an effective method for atmospheric pressure ion generation.
- The technique can produce a wide range of ions, including complex multiply charged species.
- This method holds promise for simplified and versatile chemical analysis.