Single-photon ionisation of liquid methanol and ethanol

On the photoionisation of liquid cyclohexane, 2,2,4 trimethylpentane and tetramethylsilane

“…This, together with the increase of the charge carrier yields QðEÞ with absorption, gives evidence to the fact that electron-hole pairs generated below the conduction band originate from the relaxation of autoionising states. Invoking similarities with our previous studies on alcohols [10,23] we have suggested that relaxation of these states may occur via a transient intermolecular charge transfer process [9]. Our interpretation is now further confirmed by the absence of magnetic modulation below E G in the three studied liquids.…”

“…Typical photomultiplier late peaks are observed at 23 and 480 ns. The fluorescence exhibits two distinct components, which have been extensively described in earlier work [10,[13][14][15][16][17]: a prompt exponential decay relating to the fast relaxation of the first excited singlet state of the solute with lifetime s F ; a delayed component, which appears at long time ðt > 10s F Þ, and follows the t À3=2 decay relation expected from Eq. (1), relates to the diffusion-controlled solute-ion pair recombination at long time.…”

“…The goal of the present Letter is to complete our information on these liquids by collecting experimental data on their photoionisation yields and effective cross-sections. As in our last Letter on alcohols [10], our experimental approach will be based on the detection of the charge carriers generated in the spectral domain between 6 and 10.8 eV, by using a time-resolved recombination fluorescence technique. …”

Sub-picosecond Production of Solute Radical Cations in Tetrahydrofuran after Radiolysis

“…In work examining ultrafast electron capture by conjugated polymers in THF, we noted possible production of polymer radical cations faster than 15 ps, but were unable to identify the source . Finally there have been a number of reports of delayed emission and triplets in ethers including THF − as well as in methanol and ethanol. , These are puzzling results as one would normally expect such chemistry only follows recombination of radical anions and radical cations, which should not exist in rapidly hole-fragmenting media.…”

“…8 Finally there have been a number of reports of delayed emission and triplets in ethers including THF 9−12 as well as in methanol and ethanol. 13,14 These are puzzling results as one would normally expect such chemistry only follows recombination of radical anions and radical cations, which should not exist in rapidly hole-fragmenting media.…”