Assignment of carbon chain molecules in cryogenic matrices by selective laser-induced oxidation.
Assignment of carbon chain molecules in cryogenic matrices by selective laser-induced oxidation.
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通过选择性激光诱导氧化对低温基质中的碳链分子进行分配。
DOI：
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发表时间：
2005
影响因子：
2.9
通讯作者：
W. Krätschmer
中科院分区：
文献类型：
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作者：
Dmitry V. Strelnikov;R. Reusch;W. Krätschmer
我们测试并应用激光诱导氧化方法来识别具有强紫外可见吸收的线性 C(2)(n)(+1) 分子的红外主动拉伸模式吸收。为此，我们在提供分子生长的温度下将碳蒸气分子捕获在非惰性基质（纯 O(2) 和 Ar-O(2) 混合物）中。将基质暴露于调谐至特定碳物质的紫外-可见光跃迁波长的激光下。我们观察到 C(9)、C(11)、C(13)、C(15) 和 C(21) 的紫外-可见光吸收漂白以及红外光谱中谱线的相关减少。数据表明，C(2)(n)(+1) (n > 或 = 4) 链的最强红外吸收随着 n 的增加形成规则模式。为了获得有关碳链氧化物的红外吸收的信息，应用了具有替换的 (16)O --> (18)O 同位素的氧基质。我们的数据修改了文献中现有的一些 IR 分配。
We tested and applied a laser-induced oxidation method for identifying the IR-active stretching mode absorptions of linear C(2)(n)(+1) molecules which have known strong UV-vis absorptions. For this purpose, we trapped the molecules of carbon vapor in non-inert matrices (pure O(2) and Ar-O(2) mixtures) at temperatures providing molecular growth. The matrix was exposed to laser light tuned to the wavelength of the UV-vis transition of a specific carbon species. We observed a bleaching of that UV-vis absorption and a correlated decrease of lines in the IR spectra for C(9), C(11), C(13), C(15), and C(21). The data suggest that the strongest IR absorptions of the C(2)(n)(+1) (n > or = 4) chains form a regular pattern with increasing n. To obtain information about IR absorptions of carbon chain oxides, oxygen matrices with replaced (16)O --> ( 18)O isotopes were applied. Our data revise some of the IR assignments existing in the literature.