Photo-Stimulated Desorption of Chemisorbed Oxygen Molecules from Magnesium Oxide
1986 年 55 巻 10 号 p. 3479-3483
詳細
1986 年 55 巻 10 号 p. 3479-3483
Photodesorption from oxygen pre-adsorbed MgO surfaces was studied in the temperature range of 300–473 K by mass spectrometry as compared with thermally stimulated desorption. The O2 photodesorption occurs by the ultraviolet excitation with the threshold energy of about 4.1 eV. The photodesorption rate decays as t−n with n of about 0.6, and n is little dependent on sample temperatures. The photodesorption yield decreases near 370 K with increasing temperature and this result is attributed to the thermal decay of surface electron traps. The mechanism of photodesorption is discussed.
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