Thought Experiment: Applying a high frequency high voltage to methane I am in the process of constructing a kitchen waste digester (vegetable/fruits) from which, hopefully, over time adequate methane may be collected to burn. The digester won't be complete for several months yet - a few minutes each week or so.

Anyway, if a high frequency high-voltage field were to be applied to the methane (taking due care to avoid sparks) would the methane decompose into carbon, and hydrogen? A google search seems to indicate that methane may decompose, or form a plasma; I understand there may not be a simple/straight answer for this - but a general direction would be nice to have.
To decompose methane molecule you have to apply energy about several electron-volts directly to molecule. Since microwave radiation wavelength measured in millimeters, to really decompose methane you'll need ridiculous voltage, much more them mere kilovolts needed to ignite electrical discharge.

And btw, electrical discharge is the easiest way to supply the energy needed for molecule to break.