New results are reported on the measurement of the energy and angular distribution of double differential cross section (DDCS) of bremsstrahlung (BS) photons emitted from 4.0 keV electrons in scattering by a free CH4 molecule in the angular detection range 45°-120°. The experimental DDCS spectra of CH4 are compared with DDCS spectra calculated from the atomic field bremsstrahlung formulations of Kissel-Quarles-Pratt (KQP) using additivity hypothesis. A good agreement is observed between the measured DDCS of CH4 molecule and those obtained from KQP theory.

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