However, the peak shape gives us the additional information about
Hg binding. For example, in the case of a bimodal peak, we can assume
that a part of mercury binds to the ND surface stronger than the rest,
which evaporates easily. If we continue to heat the sample, no new
peak appears, as shown in Fig. 1B. In this experiment, we heated a
RUDDM sample for 5 min and continue to measure the signal. For this
time, the sample lost more than 50% of its starting weight. For comparison,
theweight loss of the sample during the timewhen mercury evaporated
was no more than 5%. This proves once again that mercury
impurity is concentrated at the surface of ND crystals.