Sapper,
Out of curiousity, can I ask you what is your field of expertise? You are obvious well versed...
Let me elaborate a little bit on where I am coming from with my response above
, I am coming from an Electical Engineering background. Hopefully I don't ramble too much as well...
The amount of power produced by an EM wave is absolutely a function of it's frequency...but also it is a function of the Magnetic and Electric fields of the signal, which at least in the case of the E-field, is really only the gradient of the voltage. In fact, the 'Poynting Vector' S = H X E (vector cross product) is the power per unit area carried by the wave and is a vector in the direction of propagation. From that we find that the average power in a lossy medium, we can be liberal and say that our brain has SOME degree of conductivity, is:
Sav = ((mag. of E field)^2)/(2*intrinsic impedance of the medium)*e^-2az*cos (angle of absorption)
a is alpha which is the attenuation constant of the wave, which is the frequency dependant component. z is a displacement from the wave front.
Therefore, if you have say a 125 mW signal, that is having to due with the voltage at the propagation source (antenna), then that is a factor in how much energy your head will absorb.
Now, the FCC limits peak RF power exposure to 1.6 W/kg of tissue. Therefore, in the case of cell phones, which nowadays radiate about 125 mW and lower, since the antenna is SO close to the head, the exposure limits are sometimes approached.
Now since I am going to quote an article from IEEE in August 2000, which states that the energy in the frequency range at which cell phones operate is non-ionizing because the photon energy is insufficient to knock electrons from atoms in living tissue (as you have discussed in the molecular bonding sense), that is the source of biological damage from X-Rays and stuff. But, the most apparent biological effects of RF energy at cell frequencies is due to heating. I assumed that the heating was due to vibration somehow, but now I think it is something simpler....I am trying to figure that out know, maybe you have any ideas????