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Determination of the electron–phonon coupling constant in tungsten

We used two methods to determine the effective electron-phonon coupling constant (G 0) in tungsten. Our first principles calculations predict G 0 = 1.65 × 1017 W m−3 K−1. The temporal decay of the femtosecond-resolution optical reflectivity for a (100) surface of bulk W was measured using a pump-probe scheme and analysed using ab initio parameterised two temperature model, which includes both the effects of the electron-phonon coupling and thermal conduction into bulk. This analysis gives G 0 = 1.4(3) × 1017 W m−3 K−1, in good agreement with the theoretical prediction. The described effective method of calculating and measuring G0 in bulk materials can be easily extended to other metals.