The soft ionization technique that uses a UV-absorbing compound upon which the analyte of interest is placed and eventually vaporized into a plume of ions directed into the mass analyzer is:

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Matrix-assisted laser desorption ionization (MALDI) is the soft ionization technique that uses a UV-absorbing compound to form a solid matrix that absorbs energy from a laser to vaporize the analyte of interest. This produces a plume of ions that are directed into the mass analyzer. MALDI allows for the analysis of large biological molecules such as proteins and peptides, and has become a popular technique for proteomics research.

The Soft Ionization Technique That Uses a UV-Absorbing Compound Upon