Figure 3
Photographs of M2 (a) during and (b) after in situ irradiation with zeroth-order SR in oxygen at 2 × 10−3 to 1.2 × 10−2 Pa. Since M2 can slide horizontally, we used the left area first in order to leave the other area clean. The area of M2 irradiated by zeroth-order SR depends on the photon energy. |