9. If a potential function of a diatomic molecule can be described by a Morse potential, V(x) =62034e3dde960.jpg, what is the force constant k?
(A)βDe
(B) 1/2βDe 
(C) 1/2 β2De2 
(D) 2 β2De2

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統計： A(0), B(0), C(1), D(0), E(0) #2860914