Effective temperature of amorphous carbon studied using nuclear-resonance photon scattering

The effective temperature of isotopic amorphous carbon ${(}^{13}\mathrm{C})$ was measured, at 295 K, by employing the nuclear resonance photon scattering (NRPS) technique. The photon beam was in the form of bremsstrahlung obtained from an electron beam of the Stuttgart Dynamitron, with $E=4.1\mathrm{}\mathrm{MeV},$ and the resonance scattering from the 3089-keV and the 3684-keV levels in ${}^{13}\mathrm{C}$ was measured. The effective temperature of ${}^{13}\mathrm{C}$ was found to be $(822\mathrm{}\pm 123)\mathrm{K},$ which is higher by about 13% than that calculated from the experimental vibrational density of states of amorphous carbon. This deviation is discussed.