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Tracing the 267 nm-...
Tracing the 267 nm-Induced Radical Formation in Dimethyl Disulfide Using Time-Resolved X-ray Absorption Spectroscopy
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Schnorr, Kirsten (författare)
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Bhattacherjee, Aditi (författare)
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Oosterbaan, Katherine J. (författare)
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- Delcey, Mickaël G., 1988- (författare)
- University of California, Berkeley, CA 94720, United States
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Yang, Zheyue (författare)
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Xue, Tian (författare)
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Attar, Andrew R. (författare)
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Chatterley, Adam S. (författare)
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Head-Gordon, Martin (författare)
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Leone, Stephen R. (författare)
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Gessner, Oliver (författare)
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(creator_code:org_t)
- 2019-03-05
- 2019
- Engelska.
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Ingår i: The Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185. ; 10:6, s. 1382-1387
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Disulfide bonds are pivotal for the structure, function, and stability of proteins, and understanding ultraviolet (UV)-induced S–S bond cleavage is highly relevant for elucidating the fundamental mechanisms underlying protein photochemistry. Here, the near-UV photodecomposition mechanisms in gas-phase dimethyl disulfide, a prototype system with a S–S bond, are probed by ultrafast transient X-ray absorption spectroscopy. The evolving electronic structure during and after the dissociation is simultaneously monitored at the sulfur L1,2,3-edges and the carbon K-edge with 100 fs (FWHM) temporal resolution using the broadband soft X-ray spectrum from a femtosecond high-order harmonics light source. Dissociation products are identified with the help of ADC and RASPT2 electronic-structure calculations. Rapid dissociation into two CH3S radicals within 120 ± 30 fs is identified as the major relaxation pathway after excitation with 267 nm radiation. Additionally, a 30 ± 10% contribution from asymmetric CH3S2 + CH3 dissociation is indicated by the appearance of CH3 radicals, which is, however, at least partly the result of multiphoton excitation.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
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Schnorr, Kirsten
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Bhattacherjee, A ...
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Oosterbaan, Kath ...
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Delcey, Mickaël ...
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Yang, Zheyue
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Xue, Tian
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visa fler...
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Attar, Andrew R.
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Chatterley, Adam ...
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Head-Gordon, Mar ...
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Leone, Stephen R ...
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Gessner, Oliver
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visa färre...
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- NATURVETENSKAP
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