A metastable ion has sufficient internal energy to dissociate prior to detection.
2.
UV laser ablation can be combined with a flowing afterglow plasma for mass spectrometry imaging of small molecules . and IR desorption has been combined with a metastable ion source.
3.
It occurred in air and in nitrous oxide, which possess such metastable ions, and not in atmospheres of argon, carbon dioxide, or helium, which do not.
4.
Measurements in the negative ion mode are especially favorable when the analyte molecules exhibit a high gas-phase acidity, as it is the case e . g . for carboxylic acids . A direct analysis in real time ( DART ) metastable ion source for plasma based ambient ionization.
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