Relaxation processes induced by radiative electronic transitions in preirradiated rare gas solids

Photo- and thermally stimulated relaxation processes in pre-irradiated atomic solids

“…In our experiments on radiation effects in RGS (Savchenko et al, 2002(Savchenko et al, , 2003 we revealed anomalous enhanced sputtering of own atoms from the surface of Ar preirradiated by an electron beam. The sputtering characterized by nonmonotonous behavior was detected at temperatures much lower than the sublimation temperature T sb .…”

“…For pre-irradiated RGS they are self-trapped holes (STH) -dimer ionic centers, and electrons trapped at the lattice defects or "electron scavengers", as well as metastable levels of guests and products of radiation-induced reactions. We suggested (Savchenko et al, 2002(Savchenko et al, , 2003 . The excess energy about 1 eV is distributed between the two Ar atoms producing "hot" ground state atoms in the lattice.…”

“…Because both TSL and TSEE are 3 quite sensitive to the sample structure and concentration of guest centers there is clear need to make synchronous measurements of TSL, TSEE and sputtering yield at the same sample. We present for the first time the results of real time correlation study of atomic and electronic relaxation processes with an accent on the found recently (Savchenko et al, 2002(Savchenko et al, , 2003 new relaxation channel -low-temperature sputtering from pre-irradiated atomic solids.…”

Oxygen-driven relaxation processes in pre-irradiated Ar cryocrystals

“…For instance it has been suggested in [9] that this peak is caused by recombination of O -ions with neutral O atoms. Another scenario was discussed in [10,11]. It was supposed that neutral O atoms on heating started to diffuse through the Ar lattice forming oxygen molecules O 2 * .…”

“…To verify the discussed above [9][10][11] mechanisms of triggering relaxation cascades by recombination reactions we performed the experiments with synchronous measurements of thermally stimulated chemiluminescence of O 2 * stemmed from the diffusion-controlled atom-atom recombination reaction and TSEE yield as well as yields of TSEE and TSL in the VUV range originated from the intrinsic charge recombination reaction (1). The samples were doped with O 2 (10 -4 ) and the generation of O atoms under irradiation was monitored spectroscopically.…”