Glassy carbon, NIST Standard Reference Material (SRM 3600): hydrogen content, neutron vibrational density of states and heat capacity

Commercial glassy carbon plates being used as absolute intensity calibration standards in small‐angle X‐ray scattering applications (NIST SRM 3600) have been characterized in several recent publications. This contribution adds to the characterization by measuring the hydrogen content of a plate to be (4.8 ± 0.2) × 10−4 (mol H)/(mol C), and by measuring the vibrational spectrum by neutron inelastic scattering. The spectrum bears a strong resemblance to published measurements on graphite, allowing the identification of several spectral features. The measured spectrum is used to calculate the heat capacity of low‐hydrogen‐content glassy carbon for comparison with measurements reported here from 20 to 295 K. Commercial glassy carbon plates (NIST SRM 3600) being used as absolute intensity calibration standards in small‐angle X‐ray scattering applications are further characterized in terms of hydrogen content, vibrational density of states and specific heat capacity.