Can we break the covalent bonds of water molecules using resonance frequencies?

Can we break the covalent bonds of water molecules $\ce{H2O}$ using resonance frequencies? What is the wavelegth of the water's molecule? Can we create a vibration like this and use it to separate hydrogen from oxygen? 




Yes this is possible. Your question does not state the source of the frequency, but [in this internet article](http://www.sciencedaily.com/releases/2006/05/060518181301.htm) they have used laser light.


I am not sure at what frequency you need to irradiate water to break the O-H bond, but I would speculate that a good frequency would be close to the IR stretching frequencies of the O-H bond in water.


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Yes, but not through direct excitation into a dissociated state. This is explained in Ref. 1:



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> Unfortunately, measuring D0 by direct photoexcitation of H2O from its vibrational ground state to the dissociation threshold is prohibited by the negligibly small intensity of such an overtone transition.
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Instead the authors accomplished the measurement by exciting the molecule through a sequence of rovibrational states:



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> We have performed a direct measurement of one of the most fundamental thermochemical values: the O-H bond energy in water. Using a triple-resonance laser excitation scheme, we excite the molecule through a series of vibrational overtone transitions to access directly the onset of the dissociative continuum. The dissociation energy obtained from our experiments, $\pu{41145.94 ± 0.15 cm−1}$, is ∼30 times more accurate than the currently accepted value and has important implications for other thermochemical quantities linked to the bond energy of water.
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Please see the cited reference (behind paywall) for more information.


*References*


1. Pavlo Maksyutenko, Thomas R. Rizzo, and Oleg V. Boyarkina). A direct measurement of the dissociation energy of water. *J. Chem. Phys.* **125**, 181101 (2006)


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