What is clear from these figures is

What is clear from these figures is that there are two states of Ba in the' detectable surface region (estimated to be about 10-20 A thick). They have been labeled a (lower energy peak of about 779.1 eV binding energy) and yS (higher energy component at about 780.7 eV). The a component is the most predominant in a glossy polished surface. When this surface is annealed, the j3 component begins to grow. For reducing atmosphere anneals, the growth of the (3 component is faster than in oxidizing atmospheres, but the difference is only in the rate of change, not in the nature of the peaks. After prolonged anneal, the predominant component is (3, as seen in Fig. l(b).