Studies on Chemisorption of Nitrogen on Tantalum with the Field Emission Microscope

概要

論文の詳細を見る
The chemisorption of nitronen occurs on all crystal planes of tantalum and decrease the average work function as much as 0.0_0〜0.0_6eV. Three multiplex states of chemisorption are found from the observation of the field emission pattern and the measurement of the work function change. The B_1-state exists on rough planes such as the (111) plane, vicinities of the (100) and (110) planes, and nitrogen chemisorbed at this state disappears below 620°K and increases the work function of these rough planes as much as 0.2_8eV. The B_2-state exists on flat planes, that is, the (100) and (110) planes, and the B_2-nitrogen disappears below 970°K and lowers the work function as much as 0.4_2eV. The B_2-state exists on rough planes such as the (111) plane and vicinities of the (211) and (111) planes, and the change of the work function caused by the B_3-adsorption is calculated as -0.0_5eV. Nitrogen chemisorbed at this state begins to desorb at 970°K, and the desorption completes at 1370°K. The B_2-state is probably concerned with the direct absorption at its adsorption site.
社団法人応用物理学会の論文
1970-12-05