Answer 13.4

a) Right or wrong?

DART yields only positive ions. NO

DART always produces radical ions. NO

DART is suitable for samples on surfaces. YES

DART can be used to analyze samples in the gas phase. YES

The acronym DART reflects the mechanism of ionization. NO

b) DESI and DART are not the only methods of ambient MS. There is an ongoing development leading to related approaches. Name a few of these alternative methods.

Table 13.3 collects the most relevant methods of ambient MS. Apart from the well-established methods DESI and DART, desorption atmospheric pressure ionization, DAPCI, extractive electrospray ionization, EESI, and the atmospheric pressure solids analysis probe, ASAP appear most promising.