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- I want a single representative effective mass for all electrons in tin(white) for a spherical tin nano-particle (for free electron - plasma model).
For some work of mine i need the plasma resonance frequency for tin nanoparticle, i searched various research papers and found different efffective masses tin for different orbits. here i attached screen shot from W A Roger and S B Woods (Cyclotron effective masses in white tin). What value is to be used for effective mass if oscillating electric field could be incident on spherical nanoparticle of tin from any direction?