Is Frequency Quantized in Quantum Mechanics?

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As to E=hf I understand that a energy can be arbitrary in order of proportional packages to given frequency. But is there any equation in quantum mechanics which imply a freq to be quantized?
Thanks a lot!
 
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If ##E## can only take on discrete values, then ##E=hf## obviously implies that ##f## can only take on discrete values as well.

However, whether ##E## is limited to discrete values or not depends on the system. For example, a bound electron is limited that way but an unbound one is not.
 
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