X-ray radiolysis of C2 hydrocarbons in cryogenic media

Ryazantsev, Sergey V.; Zasimov, Pavel V.; Feldman, Vladimir I.

doi:10.1016/j.radphyschem.2018.06.005

Cited by 23 publications

(18 citation statements)

References 39 publications

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“…We have to stress out that this effect of "matrix cooling" is definitely more pronounced for benzene than for akliphatic hydrocarbons. 22 It is worth noting that the general concept of "inefficient cooling" can be indirectly related to the increasing yield of benzene decomposition under radiolysis with high LET particles observed previously, 35 which was attributed to large energy density within the high LET tracks.…”

Section: Resultsmentioning

confidence: 90%

“…In this case, the energy of ionizing radiation is primarily absorbed by the matrix and activation of isolated molecules occurs due to highly efficient positive hole and excitation transfer. 6,[15][16][17]22,31,32 This common scheme was directly proved for a number of aliphatic hydrocarbons and functional organic molecules based on the effect of electron scavengers and combined IR and EPR spectroscopic studies. 16,19,31,32 As shown previously, 31,32 the positive hole transfer (2) predominates for most organic molecules with an ionization energy of up to ca.…”

Section: Resultsmentioning

confidence: 93%

“…It is not valid for comparison with acetylene, which is mainly decomposed through the triplet channel. 22 The saturation in accumulation of phenyl radicals (in all matrices) and fulvene (in krypton and xenon) indicates their involvement in secondary radiation-induced processes. Regarding phenyl radicals possessing high electron affinity, most probably, they act as the scavengers of radiation-induced electrons…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

“…The highest efficiency of this process in xenon may explain some increase in the relative decomposition yield of benzene (as compared to ethane and ethylene), when going from krypton to xenon. It is not valid for comparison with acetylene, which is mainly decomposed through the triplet channel …”

Section: Resultsmentioning

confidence: 99%

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Radiation-Induced Transformations of C₆H₆ Molecules in Solid Noble-Gas Matrices: Is Benzene Intrinsically Resistant in Condensed Media?

2019

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The radiation resistance of aromatic compounds is one of the key concepts of basic and applied radiation chemistry in condensed phases. Usually, it is attributed to the intrinsic radiation stability of the benzene ring. In this work, we have demonstrated for the first time that the isolated benzene molecules undergo rather efficient radiation-induced degradation in rigid inert media at cryogenic temperatures (comparable to that of aliphatic hydrocarbons), and their stability is essentially determined by the intermolecular relaxation correlating with matrix polarizability. The principal primary products of benzene radiolysis in matrices are phenyl radicals and fulvene. The matrix environment strongly affects the proportion of these species because of external heavy atom effect on the intersystem crossing, which may trigger further reaction pathways. The obtained results may have important implications for the prediction of radiation stability of complex organic systems and polymers. Furthermore, they may contribute to a better understanding of the radiation-induced evolution of aromatic species in cold interstellar media.

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Section: Resultsmentioning

confidence: 90%