anharmonic term मीनिंग इन हिंदी

The higher-order effects of the field on the particle motion give rise to anharmonic terms in the vibrational hamiltoniom .
Treating the anharmonic terms of potential energy as perturbations , and employing the formulas for atomic displacements and hamiltonian in phonon occupation number representation , the formulas for thermal expansion coefficients of crystal nano - wires are derived and the numerical calculations are carried out in this paper