Analytes on the surface of an object can be sampled using an open-air sampling technique by vaporizing and ionizing the analyte directly from the surface under atmospheric conditions.Which of the following statements are true for these techniques?
I Direct analysis in real time generates excited He which produces protonated water clusters from distilled water.The water clusters protonate the analyte.
II Low-temperature plasma generates excited-state species in plasma,which ionizes the analyte.
III Desorption electrospray ionization directs micron-sized droplets of analyte-free solvent with electrospray,dissolving the analyte in the droplets.
IV All techniques dislodge analyte from the surface,collecting the ions for later mass spectrometer analysis.

Question

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The Answer of Analytes on the surface of an object can be sampled using an open-air sampling technique by vaporizing and ionizing the analyte directly from the surface under atmospheric conditions.Which of the following statements are true for these techniques?
I Direct analysis in real time generates excited He which produces protonated water clusters from distilled water.The water clusters protonate the analyte.
II Low-temperature plasma generates excited-state species in plasma,which ionizes the analyte.
III Desorption electrospray ionization directs micron-sized droplets of analyte-free solvent with electrospray,dissolving the analyte in the droplets.
IV All techniques dislodge analyte from the surface,collecting the ions for later mass spectrometer analysis.

Analytes on the Surface of an Object Can Be Sampled