Negative photophoresis suggests radiation with negative mass, momentum, and energy, with a negative photoelectric effect, and with a possible cooling effect on man.
Negative photophoresis occurs when light shining on a microscopically visible particle causes it to move toward the light source. Detailed experimental characteristics of negative photophoresis seem incompatible with quantum and/or classical physical postulates. Therefore it is proposed that a light source may emit a second class of radiation, one that is negative rather than positive--i.e., has negative equivalent mass, negative momentum, and negative energy. The negative momentum transferred to the illuminated particle accounts for the negative photophoresis. The negative energy of the radiation implies a negative photoelectric effect (de-excitation of electrons excited by ordinary light) consistent with observation of negative photophoresis in photoactive silver and selenium particles as reported by Ehrenhaft. Other negative photoelectric effects might well be observable by experiments of appropriate design, and may be the basis of the sensation of radiation cooling reported by von Reichenbach.
D004735:Energy Transfer; D006801:Humans; D008027:Light; D011827:Radiation; D013696:Temperature