A self-contained, cart-mounted extermination device having an internal combustion engine which produces an exhaust gas containing an asphyxiant is disclosed. The dimension between an outlet of an outgoing section of the filament, on the side of the base, and the point on the outgoing section of the filament, arranged opposite the outgoing section of the filament on the side of the base and welded to the dipping cap, measures more than approximately 5. A thermal conductivity of the first metal layer is greater than thermal conductivities of the second metal layer and the third metal layer. In some embodiments, the methods comprise obtaining mass spectra with a portable apparatus described above. The fiber length can be adjusted based on the desired eigenfrequency.