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FIGURE CAPTIONS

Figure 1. PL spectrum of the T-line luminescence system recorded at 35 K. The local mode satellites are labeled L . The insert shows the isotope splitting of the zero-phonon line at 4.2 K in material containing (a) C+H+D and (b) C C+H.

Figure 2. PL spectra of the L local vibrational mode feature from material containing (a) C+H and (b) C C+H.

Figure 3. The proposed structure of the defect giving rise to the T-center.

 
Table 1: Comparison between calculated and (experimental) vibrational modes, cm , for the 100 oriented C-(CH) and C-(CD) defects, along with their downward isotope shifts.