Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Ultrafast photochemistry of methyl hydroperoxide on ice particles
Beteiligte:
Kamboures, M. A.;
Nizkorodov, S. A.;
Gerber, R. B.
Erschienen:
Proceedings of the National Academy of Sciences, 2010
Erschienen in:
Proceedings of the National Academy of Sciences, 107 (2010) 15, Seite 6600-6604
Sprache:
Englisch
DOI:
10.1073/pnas.0907922106
ISSN:
0027-8424;
1091-6490
Entstehung:
Anmerkungen:
Beschreibung:
Simulations show that photodissociation of methyl hydroperoxide, CH 3 OOH, on water clusters produces a surprisingly wide range of products on a subpicosecond time scale, pointing to the possibility of complex photodegradation pathways for organic peroxides on aerosols and water droplets. Dynamics are computed at several excitation energies at 50 K using a semiempirical PM3 potential surface. CH 3 OOH is found to prefer the exterior of the cluster, with the CH 3 O group sticking out and the OH group immersed within the cluster. At atmospherically relevant photodissociation wavelengths the OH and CH 3 O photofragments remain at the surface of the cluster or embedded within it. However, none of the 25 completed trajectories carried out at the atmospherically relevant photodissociation energies led to recombination of OH and CH 3 O to form CH 3 OOH. Within the limited statistics of the available trajectories the predicted yield for the recombination is zero. Instead, various reactions involving the initial fragments and water promptly form a wide range of stable molecular products such as CH 2 O, H 2 O, H 2 , CO, CH 3 OH, and H 2 O 2 .