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Energetic processing of thioacetamide in cryogenic matrices.
Sándor Góbi1,2, Barbara Keresztes2,3, Anita Schneiker2,3
1MTA-ELTE Lendület Laboratory Astrochemistry Research Group, Institute of Chemistry, ELTE Eötvös Loránd University, P.O. Box 32, H-1518 Budapest, Hungary.
The Journal of Chemical Physics
|January 12, 2024
Summary
Investigating thioacetamide in low-temperature matrices reveals its decomposition pathways under irradiation. This study provides insights into sulfur chemistry in space, identifying potential interstellar molecules.
Area of Science:
- Astrochemistry
- Chemical Physics
- Spectroscopy
Background:
- Sulfur depletion in the interstellar medium (ISM) necessitates studying sulfur-containing molecules.
- Thioacetamide is a relevant precursor for investigating interstellar sulfur chemistry at low temperatures.
Purpose of the Study:
- To investigate the low-temperature photochemistry and radiolysis of thioacetamide (H3C-C(=S)-NH2).
- To identify decomposition products and pathways of thioacetamide in inert Ar and para-H2 matrices.
- To assess the influence of different matrices and irradiation sources on thioacetamide's stability and reactivity.
Main Methods:
- Infrared (IR) spectroscopy was used to analyze thioacetamide in Ar and para-H2 matrices.
- Samples were subjected to various irradiation sources: Lyman-α, UV photons, and energetic electrons.
- Decomposition products were identified by comparing experimental results with known spectral signatures.
Main Results:
- Three primary decomposition channels were identified, yielding products like HNCS, H2S, NH3, and various carbon-nitrogen compounds.
- Isomers H3C-CN and H3C-NC were detected, along with secondary products HNC and HCN in para-H2 matrices.
- Most observed decomposition products are found in the ISM, with H2C=C=NH and H3C-NC being exceptions.
Conclusions:
- Thioacetamide is sensitive to energetic radiation, suggesting its potential role in interstellar chemical evolution.
- The matrix environment (Ar vs. para-H2) influences the observed decomposition products.
- Findings provide a basis for future experiments on pure thioacetamide ice relevant to astrochemistry.
