We used the Gyrotron FU CW GVIB far-infrared radiation system, which can expose samples to a 420 GHz wave with a maximum power of 20 W [23]. The radiation wavelength was 720 μm, and the pulse duration was 1 ms at 5 Hz oscillation. The temperature increase of the sample during the irradiation was monitored using a Testo 875 thermography camera (Testo). The amyloid sample in aqueous solution (10 μL) was put on the slide base and was irradiated with the far-infrared ray at room temperature (ca. 25 °C).
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