dorsal/arxiv
View SchemaLight-induced temperature jump causes power-dependent ultrafast kinetics of electrons generated in multiphoton ionization of liquid water
| Authors | Robert A. Crowell, Rui Lian, Ilya A. Shkrob, Jun Qian, Dmitri A. Oulianov, Stanislas Pommeret |
|---|---|
| Categories | |
| ArXiv ID | physics/0405013 |
| URL | https://arxiv.org/abs/physics/0405013 |
| DOI | 10.1021/jp048074a |
Abstract
Picosecond geminate recombination kinetics for electrons generated by multiphoton ionization of liquid water become power dependent when the radiance of the excitation light is greater than 0.3-0.5 TW/cm^2 (the terawatt regime). To elucidate the mechanism of this power dependence, tri- 400 nm photon ionization of water has been studied using pump-probe laser spectroscopy on the pico- and femtosecond time scales. We suggest that the observed kinetic transformations are caused by a rapid temperature jump in the sample. Such a jump is inherent to multiphoton ionization in the terawatt regime, when the absorption of the pump light along the optical path becomes very nonuniform. The heating of water is substantial (tens of degrees C) because the 3-photon quantum yield of the ionization is relatively low, ca. 0.42, and a large fraction of the excitation energy is released into the solvent bulk as heat. Evidence of the temperature jump is the observation of a red shift in the absorption spectrum of (thermalized) electron and by characteristic "flattening" of the thermalization dynamics in the near infra-red. The temperature jump in the terawatt regime might be ubiquitous in multiphoton ionization in molecular liquids. The implications of these observations for femtosecond pulse radiolysis of water are discussed.
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"abstract": "Picosecond geminate recombination kinetics for electrons generated by\nmultiphoton ionization of liquid water become power dependent when the radiance\nof the excitation light is greater than 0.3-0.5 TW/cm^2 (the terawatt regime).\nTo elucidate the mechanism of this power dependence, tri- 400 nm photon\nionization of water has been studied using pump-probe laser spectroscopy on the\npico- and femtosecond time scales. We suggest that the observed kinetic\ntransformations are caused by a rapid temperature jump in the sample. Such a\njump is inherent to multiphoton ionization in the terawatt regime, when the\nabsorption of the pump light along the optical path becomes very nonuniform.\nThe heating of water is substantial (tens of degrees C) because the 3-photon\nquantum yield of the ionization is relatively low, ca. 0.42, and a large\nfraction of the excitation energy is released into the solvent bulk as heat.\nEvidence of the temperature jump is the observation of a red shift in the\nabsorption spectrum of (thermalized) electron and by characteristic\n\"flattening\" of the thermalization dynamics in the near infra-red. The\ntemperature jump in the terawatt regime might be ubiquitous in multiphoton\nionization in molecular liquids. The implications of these observations for\nfemtosecond pulse radiolysis of water are discussed.",
"arxiv_id": "physics/0405013",
"authors": [
"Robert A. Crowell",
"Rui Lian",
"Ilya A. Shkrob",
"Jun Qian",
"Dmitri A. Oulianov",
"Stanislas Pommeret"
],
"categories": [
"physics.chem-ph",
"physics.optics"
],
"doi": "10.1021/jp048074a",
"title": "Light-induced temperature jump causes power-dependent ultrafast kinetics of electrons generated in multiphoton ionization of liquid water",
"url": "https://arxiv.org/abs/physics/0405013"
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