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What is iodine?
Published in Tatsuo Kaiho, Iodine Made Simple, 2017
In the 1970s, James Lovelock, who advocated the Gaia hypothesis, used a gas chromatograph/electron capture detector (GCECD) and discovered that methyl iodide (CH3I), a volatile organic iodine, is widely distributed in seawater and in the atmosphere. He showed that the inorganic iodine in seawater is organified (methylation) though biological reactions in macroalgae such as kelp, microalgae, and marine bacteria. As it evaporates into the atmosphere, it circulates dynamically throughout the global environment. Furthermore, other chemical forms of volatile organic iodine have been discovered, including diiodo-methane (CH2I2), chloroiodomethane (CH2ClI), and ethyl iodide (CH3CH2I).
Imaging the elusive C–C bond dissociation channel of photoexcited ethyl radical
Published in Molecular Physics, 2022
Sonia Marggi Poullain, Luis Rubio-Lago, David V. Chicharro, Aymen Boullagui, Alexandre Zanchet, Ounaies Yazidi, Alberto García-Vela, Luis Bañares
To the best of our knowledge, there is no data regarding the energetics of the photodissociation of ethyl iodide at 197.4 nm, but the processes at 199.98 and 201 nm have been recently studied in our group, precisely at the excitation wavelengths 201.19 nm [20,21] and 200.08 nm [21] with nanosecond [20] and femtosecond [21] lasers. In particular, the photodissociation of ethyl iodide at 201.19 nm produces ethyl radicals in correlation with iodine atoms in both spin-orbit states, I() and I() [20] (no I() was observed in the femtosecond experiments reported in Ref. [21] due to the quantum yield for production of I, , close to one). The fractions of the available energy channelled into internal degrees of freedom of the products for the CH + I and CH + I channels, , are 0.68 and 0.44, respectively, although in the latter case, the corresponding broad distribution ranges from 0.33 to 0.61 [20].