Photoionization in Non‐Polar Liquids

Yakovlev, B.S.; Lukin, L.V.

doi:10.1002/9780470142844.ch3

Cited by 36 publications

(14 citation statements)

References 118 publications

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“…Eqs. ( 4) and ( 5) have already been derived, albeit in a different form, by Yakovlev and co-workers, 6,20,41 who studied photoinduced electron detachment from lowtemperature hydrocarbons; the study of room temperature liquids was prohibited by inadequate time resolution of their setup. Balakin et al 20 used 694 nm photoexcitation of electrons in iso-octane at T=175 K ( µ e ≈1.7 cm 2 /Vs) to estimate τ t ≈ 22±6 ps,…”

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confidence: 99%

“…The smallness of the product µ τ f f is readily accounted for in the "quasiballistic" model of electron transport 22 as an indication of the regime in which the relaxation of the velocity of free electron takes longer than its localization. Yakovlev and Lukin, 6 however, suggested that the product µ τ f f in eq. ( 4) should be replaced by a sum…”

mentioning

confidence: 99%

“…This arbitrariness decreases the confidence in the estimates of Yakovlev and coworkers. 6,20,41 Thus, we aimed to explore the region near room temperature, for which better estimates of all the parameters involved are available. The additional benefit of studying this region is the ability to directly compare our estimates with those obtained theoretically 21,22,29 and from the THz experiments.…”

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confidence: 99%

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Photostimulated electron detrapping and the two-state model for electron transport in nonpolar liquids

Shkrob¹,

Sauer²

2005

The Journal of Chemical Physics

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In common nonpolar liquids, such as saturated hydrocarbons, there is a dynamic equilibrium between trapped (localized) and quasifree (extended) states of the excess electron (the two-state model). Using time-resolved dc conductivity, the effect of 1064 nm laser photoexcitation of trapped electrons on the charge transport has been observed in liquid n-hexane and methylcyclohexane. The light promotes the electron from the trap into the conduction band of the liquid. From the analysis of the two-pulse, two-color photoconductivity data, the residence time of the electrons in traps has been estimated as ca. 8.3 ps for n-hexane and ca. 13 ps for methylcyclohexane (at 295 K). The rate of detrapping decreases at lower temperature with an activation energy of ca. 200 meV (280-320 K); the lifetime-mobility product for quasifree electrons scales linearly with the temperature. We suggest that the properties of trapped electrons in hydrocarbon liquids can be well accounted for using the simple spherical cavity model. The estimated localization time of the quasifree electron is 20-50 fs; both time estimates are in agreement with the "quasiballistic" model. This localization time is significantly lower than the value of 310±100 fs obtained using time-domain terahertz (THz) spectroscopy 2.for the same system [E. Knoesel et al., J. Chem. Phys. 121, 394 (2004)]. We suggest that the THz signal originates from the oscillations of electron bubbles rather than the freeelectron plasma; vibrations of these bubbles may be responsible for the deviations from the Drude behavior observed below 0.4 THz. Various implications of these results are discussed.

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confidence: 99%

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Photostimulated electron detrapping and the two-state model for electron transport in nonpolar liquids

Shkrob¹,

Sauer²

2005

The Journal of Chemical Physics

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“…It should be noted that the Eqs. (17) and (19) describe well experimental data on free ion yields in non-polar liquids and solids, including organic crystals and polymeric photoconductors [48]. However, in the approach of Onsager [44], it is assumed that the recombination radius is infinitesimally small, i.e.…”

Section: Conductivity Kinetics Of Geminate Radical Ion Pairsmentioning

confidence: 96%

Investigation of geminate recombination of radical ion pairs generated by dissociation of exciplexes in moderately polar solvents using the photoconductivity technique

Lukin

2009

Chemical Physics

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“…In solution, most of these geminate ion pairs relax into initial molecules, and the probability for dissociation into free ion pairs which can contribute to the electric current is extremely low (several percent). 23 If these geminate ion pairs are excited further, the distance between the molecular ions and the electrons is increased, and thus the yield of free ion pairs which can contribute to the electric current is expected to increase. From these viewpoints, we have attempted to increase the yield of free ion pairs generated from geminate ion pairs by irradiating the geminate ion pairs with the near-infrared laser light synchronized with the ultraviolet laser light.…”

Section: ·3 Two-color Multiphoton Ionization Detectionmentioning

confidence: 99%

Applications of Strong Interactions between Photons and Molecules to Analytical Sciences

Yamada

2009

ANAL. SCI.

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Spectroscopic measurements and applications to analytical sciences utilizing strong interactions between photons and molecules will be described. In particular, this report demonstrates high-sensitivity analysis of chemical species in solution through laser multiphoton ionization, and selective detection and characterization of the molecules located at solid surfaces and phase boundaries by using the method of second harmonic generation. Furthermore, new spectroscopic methods and sensitivity improvements utilizing the resonance of incident light photons with surface plasmons emerging on the surfaces of gold nanoparticles and nanostructures are presented. In addition, applications of surface plasmon resonance to spatio-selective plating to microscopic sites and to the field of nanobiotechnology are described, with special focusing on controlling biomolecules.

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Photoionization in Non‐Polar Liquids

Cited by 36 publications

References 118 publications

Photostimulated electron detrapping and the two-state model for electron transport in nonpolar liquids

Photostimulated electron detrapping and the two-state model for electron transport in nonpolar liquids

Investigation of geminate recombination of radical ion pairs generated by dissociation of exciplexes in moderately polar solvents using the photoconductivity technique

Applications of Strong Interactions between Photons and Molecules to Analytical Sciences

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