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Hydrogen isotope fractionation in the photolysis of formaldehyde

Cited 22 time in wos
Cited 22 time in scopus

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dc.contributor.authorC.A.M. Brenninkmeijer-
dc.contributor.authorRhee, Tae Siek-
dc.contributor.authorT. Roeckmann-
dc.date.accessioned2018-03-20T14:04:12Z-
dc.date.available2018-03-20T14:04:12Z-
dc.date.issued2008-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/6605-
dc.description.abstractExperiments investigating the isotopic fractionation in the formation of H2 by the photolysis of CH2O under tropospheric conditions are reported and discussed. The deuterium (D) depletion in the H2 produced is 500(±20) ‰ with respect to the parent CH2O. We also observed that complete photolysis of CH2O under atmospheric conditions produces H2 that has virtually the same isotope ratio as that of the parent CH2O. These findings imply that there must be a very strong concomitant isotopic enrichment in the radical channel (CH2O + h?→ CHO + H) as compared to the molecular channel (CH2O + h?→ H2 + CO) of the photolysis of CH2O in order to balance the relatively small isotopic fractionation in the competing reaction of CH2O with OH. Using a 1-box photochemistry model we calculated the isotopic fractionation factor for the radical channel to be 0.22(±0.08), which is equivalent to a 780(±90) ‰ enrichment in D of the remaining CH2O. When CH2O is in photochemical steady state, the isotope ratio of the H2 produced is determined not only by the isotopic fractionation occurring during the photolytical production of H2 (?m) but also by overall fractionation for the removal processes of CH2O (?f), and is represented by the ratio of ?m/?f. Applying the isotopic fractionation factors relevant to CH2O photolysis obtained in the present study to the troposphere, the ratio of ?m/?f varies from ~0.8 to ~1.2 depending on the fraction of CH2O that reacts with OH and that produces H2. This range of ?m/?f can render the H2 produced from the photochemical oxidation of CH4 to be enriched in D (with respect to the original CH4) by the factor of 1.2 ?1.3 as anticipated in the literature.-
dc.formatapplication/pdf-
dc.languageEnglish-
dc.titleHydrogen isotope fractionation in the photolysis of formaldehyde-
dc.title.alternative포말데하이드 광해리 과정에서 일러나는 수소 동위원소 차별화-
dc.typeArticle-
dc.identifier.bibliographicCitationC.A.M. Brenninkmeijer, Rhee, Tae Siek, T. Roeckmann. 2008. "Hydrogen isotope fractionation in the photolysis of formaldehyde". <em>Atmospheric Chemistry and Physics</em>, 8(5): 1353-1366.-
dc.citation.titleAtmospheric Chemistry and Physics-
dc.citation.volume8-
dc.citation.number5-
dc.identifier.doi10.5194/acp-8-1353-2008-
dc.citation.startPage1353-
dc.citation.endPage1366-
dc.description.articleClassificationSCI-
dc.description.jcrRateJCR 2006:2.083333333333333-
dc.subject.keywordformaldehyde-
dc.subject.keywordfractionation-
dc.subject.keywordhydrogen-
dc.subject.keywordisotope-
dc.subject.keywordphotolysis-
dc.identifier.localId2008-0038-
dc.identifier.scopusid2-s2.0-40549101357-
dc.identifier.wosid000253908600017-
Appears in Collections  
2007-2010, Integrated research on the COMposition of Polar Atmosphere and Climate Change(COMPAC) (07-10) / Lee, Bang Yong (PE07030, PE08030, PE09030, PE10030, PG07012)
2007-2008, 모형 실험을 이용한 기후 변화와 대기 수소농도 변화 관계 고찰 (07-08) / Rhee, Tae Siek (PN07060)
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