Matrix isolation andab initiostudy on HCN/CO2system and its radiation-induced transformations: Spectroscopic evidence for HCN⋯CO2andtrans-HCNH⋯CO2complexes

2016 ◽  
Vol 145 (21) ◽  
pp. 214309 ◽  
Author(s):  
Svetlana V. Kameneva ◽  
Daniil A. Tyurin ◽  
Kirill B. Nuzhdin ◽  
Vladimir I. Feldman
Keyword(s):  
Matrix Isolation ◽  
Spectroscopic Evidence ◽  
Radiation Induced

Matrix isolation model studies on the radiation-induced transformations of small molecules of astrochemical and atmospheric interest

2016 ◽  
Vol 124 ◽  
pp. 7-13 ◽  
Author(s):  
Vladimir I. Feldman ◽  
Sergey V. Ryazantsev ◽  
Elizaveta V. Saenko ◽  
Svetlana V. Kameneva ◽  
Ekaterina S. Shiryaeva
Keyword(s):  
Small Molecules ◽  
Matrix Isolation ◽  
Model Studies ◽  
Radiation Induced

Radiation-induced transformations of acetaldehyde molecules at cryogenic temperatures: a matrix isolation study

2021 ◽  
Author(s):  
Pavel V Zasimov ◽  
Elizaveta V Sanochkina ◽  
Vladimir I. Feldman
Keyword(s):  
Uv Radiation ◽  
Organic Molecules ◽  
Matrix Isolation ◽  
Cryogenic Temperatures ◽  
Small Organic Molecules ◽  
Atmospheric Processes ◽  
Radiation Induced

Acetaldehyde is one of the key small organic molecules involved in astrochemical and atmospheric processes occurring under the action of ionizing and UV radiation. While the UV photochemistry of acetaldehyde...

Radiation-induced chemistry in the C2H2–H2O system at cryogenic temperatures: a matrix isolation study

2019 ◽  
Author(s):  
Pavel V Zasimov ◽  
Sergey V Ryazantsev ◽  
Daniil A Tyurin ◽  
Vladimir I Feldman
Keyword(s):  
Molecular Level ◽  
Matrix Effects ◽  
Noble Gas ◽  
Matrix Isolation ◽  
Isolation Technique ◽  
X Ray ◽  
Mechanistic Insight ◽  
Radiation Induced ◽  
Temperature Radiation ◽  
Reaction Routes

Abstract Investigations of the low-temperature radiation-induced transformations in the C2H2–H2O system are relevant to the chemistry occurring in interstellar and cometary ices. In this work we applied a matrix isolation technique to study the radiation-driven evolution of this system at molecular level in order to get new mechanistic insight. The 1:1 C2H2∙∙∙H2O complexes were prepared in various solid noble-gas matrices (Ar, Kr, Xe) and these icy matrices were subjected to X-ray irradiation at 5 K. Decomposition of initial complex and formation of products were monitored by FTIR spectroscopy. It was found that complexation with H2O resulted in significant enhancement of the radiolytic decay of C2H2 molecules and provided new channels for its radiation-induced transformations. Ketene (both isolated H2CCO and in the form of H2CCO–H2 pair), ketenyl radical (HCCO), carbon monoxide (CO) and methane (CH4) were observed as main products of the C2H2∙∙∙H2O radiolysis. In addition, vinyl alcohol (CH2CHOH) was detected in an Ar matrix. The mechanistic interpretation (reaction routes leading to formation of these products) is discussed on the basis of consideration of kinetic dependencies and matrix effects. Conversion of C2H2∙∙∙H2O to CH4 is a prominent example of water-mediated cleavage of the C≡C triple bond, which may occur under prolonged irradiation in rigid media. Possible astrochemical implications of the obtained results are highlighted.

Radiation-induced synthesis of formic acid in the H2O–CO system: A matrix isolation study

2020 ◽  
Vol 753 ◽  
pp. 137540 ◽  
Author(s):  
Sergey V. Ryazantsev ◽  
Pavel V. Zasimov ◽  
Vladimir I. Feldman
Keyword(s):  
Formic Acid ◽  
Matrix Isolation ◽  
System A ◽  
Radiation Induced

Matrix Isolation of Germacyclopentadienes:  Direct Spectroscopic Evidence for Germylene-to-Germene Photochemical Interconversion

1996 ◽  
Vol 15 (22) ◽  
pp. 4714-4724 ◽  
Author(s):  
Valery N. Khabashesku ◽  
Sergei E. Boganov ◽  
Dean Antic ◽  
Oleg M. Nefedov ◽  
Josef Michl
Keyword(s):  
Matrix Isolation ◽  
Spectroscopic Evidence

Radiation-induced transformations of methanol molecules in low-temperature solids: a matrix isolation study

2016 ◽  
Vol 18 (47) ◽  
pp. 32503-32513 ◽  
Author(s):  
Elizaveta V. Saenko ◽  
Vladimir I. Feldman
Keyword(s):  
Low Temperature ◽  
Matrix Effects ◽  
Matrix Isolation ◽  
Radiation Induced

Radiation-induced transformations of methanol in inert solids at 6 K reveal remarkable matrix effects, and mechanisms and astrochemical implications are discussed.

Prototypical cyclohexane dimers: spectroscopic evidence for σ stacking at low temperatures

2020 ◽  
Vol 22 (2) ◽  
pp. 905-913 ◽  
Author(s):  
N. Ramanathan ◽  
Shubhra Sarkar ◽  
K. Sundararajan
Keyword(s):  
Infrared Spectroscopy ◽  
Low Temperatures ◽  
Matrix Isolation ◽  
Stacking Interactions ◽  
Spectroscopic Evidence

In this work, the first unambiguous spectroscopic evidence for the existence of σ stacking interactions in cyclohexane dimers has been provided using matrix isolation infrared spectroscopy.

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