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Ultra-high-resolution infra-red local vibrational mode (IR LVM) spectroscopy measurements together with density-functional calculations have been used to identify the signatures of close substitutional nitrogen (NAs) pairs in GaAs1-xNxalloys with concentrations of x<0.025.We show that the presence of sub-peaks close to the NAsabsorption band can be attributed to nitrogen pairs up to fourth neighbor...
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