Theoretical calculation on electronic excitation and compression effect in tungsten

The vacancy formation enthalpy of tungsten under the condition of intense laser irradiation and compression has been investigated from first-principles, respectively. The results show that the monovacancy formation enthalpy of tungsten tends to increase as the electronic temperature is increased, which can explain the fact that the melting process becomes more difficult under high electronic temperature. In addition, the monovacancy formation enthalpy of tungsten is found to increase from 3.198 eV at 0 GPa to 4.184 eV at 100 GPa, which results in the retardation of diffusion under the condition of compression.