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The delayed explosive desorption of particles from Ar matrices doped withmethane stimulated by an electron irradiation was studied in the extendedconcentration range from 1% to 10% using emission spectroscopy methods.Registration of the cathodoluminescence (CL) spectra of CH4-containig Armatrices revealed following products of radiation-induced methanetransformation: H, CH and C. Three series of experiments were performed withdifferent irradiation and heating modes: (i) continuous irradiation at lowtemperature with accumulation of radiolysis products, (ii) heating of thepre-irradiated films with measurements of relaxation emissions, specificallythermally stimulated exoelectron emission (TSEE) and (iii) external heating ofthe pre-irradiated films under beam. These measurments of the, so called,nonstationary luminescenve (NsL) at the selected wavelenghs and nonstationarydesorption (NsD) in combination with TSEE registration provided an informationon reactions of charged and neutral species of interest. Taking into accountthat the CH radical can be considered as a signature of the CH3 species [27] weobtained the information on a role of H atoms and CH3 radicals in stimulationof explosive delayed desorption of particles from Ar matrices doped withmethane. Two bursts of long-period self-oscillations together with short-periodones with a limited number of periods were observeed during stationaryirradiation of all methane-doped Ar matrices at low temperatures. Processesleading to the self-oscillations of particle yield are discussed.

Delayed burst of particles from Ar matrices doped with CH4 and radical-radical interaction