| abstract |
In a method of desorbing a substance fixed on a surface of a substrate from the surface by laser light irradiation, capturing the substance, and performing mass spectrometry, a laser beam with lower power can be used. A substance fixed on the surface of a substrate is desorbed from the surface by laser light irradiation, and the mass is captured as a substrate for mass spectrometry. At least a part of the surface is used as a substrate for mass analysis. A rough metal surface that can excite localized plasmons when irradiated with laser light (for example, in a large number of micropores 6 formed on the surface of the alumina layer 5, the head larger than the diameter of the micropores 6 has an alumina layer 5. A substrate 3 is used which is filled with gold fine particles 8 in a state of protruding above the surface. [Selection] Figure 1 |