| http://www.w3.org/ns/prov#value | - That is, if the (Al0.7 Ga0.3)0.5 In0.5 P layer 14 is contaminated by impurities such as oxygen and steam in the atmosphere inside the MBE apparatus during the inactive time of several seconds between the stop of radiation of P molecular beams and the start of radiation of As molecular beams, such contamination is purified by replacement of In and P in the contaminated area with As.
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