Photoionization in solid solutions at 77°K. Ionization potentials

Moan, Johan Emelian

doi:10.1016/0009-2614(73)80213-1

Cited by 13 publications

(3 citation statements)

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“…Only a handful of liquid-phase IP's have been reported. Several measurements have been made for N , N , N ‘, N ‘-tetramethyl-1,4-phenylenediamine (TMPD). − Due to its low IP g of 6.7 eV, TMPD •+ does not bleach upon 2.3 eV photoexcitation, in both alcohols and cycloalkanes. Several IP's have been reported for indole (IP g = 7.76 eV) , and l -tryptophan (IP g ≈ 7.8 eV); ,, see Table .…”

Section: Introductionmentioning

confidence: 99%

“…Several measurements have been made for N , N , N ‘, N ‘-tetramethyl-1,4-phenylenediamine (TMPD). − Due to its low IP g of 6.7 eV, TMPD •+ does not bleach upon 2.3 eV photoexcitation, in both alcohols and cycloalkanes. Several IP's have been reported for indole (IP g = 7.76 eV) , and l -tryptophan (IP g ≈ 7.8 eV); ,, see Table . For aromatic solutes other than TMPD, the data on IP liq in hydrocarbons are sparse; we found several results for pyrene and anthracene and a single result for perylene in n- hexane …”

Section: Introductionmentioning

confidence: 99%

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Reactions of Photoexcited Aromatic Radical Cations with Polar Solvents

et al. 1998

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Reactions of electronically excited radical cations of various simple aromatic hydrocarbons (e.g., naphthalene, biphenyl, perylene) and amines (indole and L-tryptophan) with polar solvents (alcohols, ethers, and water) were studied. The radical cations were generated by biphotonic (248 nm) photoionization of aromatic solutes in oxygen-saturated solutions and subsequently excited by 2.3 eV photons from a Nd:YAG laser. The photobleaching is initiated by a transfer of the valence electron of the solvent to the solute radical cation ("hole injection"). In the polar liquids, a proton transfer occurs concurrently with this electron transfer and may occur in several ways. Hole injection is the general mechanism for decay of photoexcited radical cations, in both polar and nonpolar media. The efficiency of this process correlates with the ionization potential (IP) of the solute and optical absorbance of the corresponding radical cation. For high-IP solutes, the quantum yield of the photobleaching is 0.3-0.5. From scavenging of the photoexcited radical cations, it was found that while some of these states have the lifetimes below 1 ps, other have lifetimes of 10-40 ps (in acetonitrile).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reactions of Photoexcited Aromatic Radical Cations with Polar Solvents

et al. 1998

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“…meros autores (SZENT-GYORGYI, 1941;ANDERSON, 1947;S 1963;WHITE e colabs., 1970;GUTHANS e colabs. ClLENTO, 1965, 1973. (BRUNE colabs., 1982; (iv) a transformação das pré-vitamin gosterol e 7-dehidrocolesterol em vitaminas O 2 e 0 3 , pectivamente, é dependente de luz (JACOBS e HAVING BILLS (1927) observou que a quantidade de vitamina contrada em certos peixes era muito superior àquela rada por ingestão de alimentos ou pela intensidade acessível.…”

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