Vapour-Phase IR Spectrum
Definition
The infrared spectrum recorded as a GC analyte elutes into a heated light pipe inside the FTIR cell, with no solvent or KBr matrix. Vapour-phase bands are slightly shifted from condensed-phase reference spectra, which is why GC-FTIR work uses dedicated vapour-phase libraries rather than the standard Aldrich or Sadtler condensed-phase collections.
Related terms
- Atmospheric Pressure Chemical Ionisation (APCI)
- A complementary atmospheric-pressure source that vaporises the LC eluent and uses a corona discharge to ionise a reagent gas, which transfers charge...
- Electrospray Ionisation (ESI)
- A soft atmospheric-pressure ionisation source that sprays the LC eluent through a charged capillary into a heated counter-current gas, producing protonated or...
- GC-MS Interface
- The physical link between a gas chromatograph and a mass spectrometer. Older designs used jet separators and open splits to manage the...
- Hyphenated Technique
- A single workflow that couples a separation method to a spectroscopic detector, so a complex mixture is resolved and each component identified...
- MRM (Multiple Reaction Monitoring)
- A targeted MS/MS scan mode on a triple quadrupole that monitors specific precursor-to-product ion transitions, with two transitions per analyte (quantifier and...
Explained in
- Hyphenated Techniques: GC-MS, LC-MS and GC-FTIRThe infrared spectrum recorded as a GC analyte elutes into a heated light pipe inside the FTIR cell, with no solvent or KBr matrix. Vapour-phase bands are slig...