Mass spectroscopy is a qualitative analytical technique suitable for organic compounds. It provides pieces of information which helps to puzzle out chemical species structures of even small amounts of a mixture. We own an ITQ 700 Thermo Scientific mass spectroscopy device linked to a gas chromatograph used on a daily basis since 2009. Analyzed products are usually low boiling temperature organic compounds which molecular weight is below 400°C. Analysis are made using Electronic Impact (EI) technique, and if necessary Chemical Ionization (CI) by methane is used. Samples are extracted from chemical synthesis, diluted in light solvent. Average scan time is about 30 minutes. Low volatility compounds can also be analyzed by direct introduction into the ion source without getting through the chromatograph column. Mass spectra obtained can be compared to those in a database to help in compound identification process. Molecules getting in the source are ionized by electrons produced by a heated up rhenium filament. Then, ions are extracted and focalized by three lenses onto the center of the trap. The trap consists of a ring electrode covered by two end caps. During the first step ions are stabilized into the trap moving in circles controlled by a superposition of continuous and alternative voltages applied between electrodes forming a kind of quadripole. Then, as the amplification of voltages grows, ions are ejected according to their M/Z value and detected by an electron multiplier.
- mass limits: 50 to 700
- Ion Trap System
- Ionisation Sources EI (electronic impact) et CI (chemical ionisation)
- Possibilities: MS/MS, direct injection.
- Xcalibur software driven ITQ700
For all other inquiries, please contact Patrice Renevret