“…The o p t i c a l l y derived thicknesses varied from 0.9 )1 t o 1.3 fl. The o p t i c a l measurements of near normal r e f l e c t a n c e and transmittance a t various temperature Tmwere done i n two apparatus which were described previously [2,3]. The o p t i c a l gap Eg(Tm) was calculated from absorption c o e f f i c i e n t a according t o t h e equation (aII)lf2 = y [ ~ -E~(T,)] where E i s t h e photon energy and y t h e slope of t h e s t r a i g t h line.…”
Section: -Introduction0 Many Inveo T I G a T Ions T O Determine How T...mentioning
“…The o p t i c a l l y derived thicknesses varied from 0.9 )1 t o 1.3 fl. The o p t i c a l measurements of near normal r e f l e c t a n c e and transmittance a t various temperature Tmwere done i n two apparatus which were described previously [2,3]. The o p t i c a l gap Eg(Tm) was calculated from absorption c o e f f i c i e n t a according t o t h e equation (aII)lf2 = y [ ~ -E~(T,)] where E i s t h e photon energy and y t h e slope of t h e s t r a i g t h line.…”
Section: -Introduction0 Many Inveo T I G a T Ions T O Determine How T...mentioning
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