A charged harmonic oscillator of mass m=1 and charge q=1 is oscillating under the influence of a spring with natural frequency ω'=(k/m)^(1/2) , where k=1 is the force constant ,and is found in the ground state. If suddenly an external electrical field E=1 is turned on such that the total potential of system becomes (1/2)m(ω'x)^2 -qEx (a) Show that by change of variable the system equivalent to another harmonic oscillator. what is the new frequency ω? (b) what is the probability of finding the system in the ground state and first excited state of the system after the E-field is turned on? 小妹修量子力学遇到了困扰，请高人指点... --

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