Possibility of realizing fullerene-oxygen-iodine laser with solar pumping (sun-light FOIL)

Abstract

We consider the possibility to design the thhlerene-oxygen-iodine laser with optical pumping (solar, particularly) [1]. It is assumed that singlet oxygen is formed at pass ofmolecular oxygen through (and interaction with) mixture oflower and higher fullerenes in the triplet metastable state obtained at illumination of fullerenes. The presented results of estimates by a photokinetic model show the opportunity to reach the efficiency of the FOIL with solar pumping at the level of several tens of percents. We present the results of experimental and theoretical studies of singlet oxygen yield at interaction of optical pumping with frillerene in solutions. Laser radiation with wavelength of 532 nm and wideband lamp radiation for imitation of solar radiation were used as pumping. The paper presents the first experimental results on the yield of singlet oxygen, produced in vacuum chamber via interaction of gas-phase molecular oxygen with thllerene devices, irradiated by solar-like lamp emission.

<title>On the possibility of realizing the singlet oxygen generator on the base of optically pumped fullerenes and of fullerene-like nanoparticles</title>

“…Now a few words concerning the object of studies, on which was realized interaction of photons, fullerenes (or FLNP) and oxygen. First of all, similarly to [1], we have continued studying of the singlet oxygen generation in liquid media and, in particular, in solutions. We have also started investigation of suspensions.…”

“…In the latter case the energy of radiation could have been much higher than that of laser radiation, and its energy and power was varied in the wide range. Xe-lamp radiation was used either without additional spectral modification or with attenuation by special set of colored filters, making its spectrum close to that of sunlight (see In the experiment was registered the radiation of singlet oxygen luminescence at the wavelength 1 .268 tm (state AO) and 0.762 m (state O) Similarly to [1], all measurements were done in the absolute scale, providing thus the possibility to carry out the detailed comparison of experimental results with results of numerical simulation of photochemical kinetics, taking into account the influence of various quenchers onto the lifetime of triplet states of fullerenes and FLNP and of the singlet oxygen. Before the experiment, all measurement apparatus was tested and calibrated.…”

“…Similarly to [1], optical pump was provided by two means -either by irradiation of light of second harmonics of Nd-laser (pumping wavelength 532 nm, pulse duration -40 ns, pumping energy fluency E < 0.6 J/cm2) or by light of Xelamp with pulse duration '25O ts. In the latter case the energy of radiation could have been much higher than that of laser radiation, and its energy and power was varied in the wide range.…”

“…It is supposed that the singlet oxygen is produced via the interaction ofmolecular oxygen with the triplet state of fullerene, subjected to light irradiation. In [1] were given the first experimental results, related to singlet oxygen generation in solution of C60 in Cd4 (solvent), when this solution was saturated by oxygen and irradiated by light from various sources, including sunlight. In the same paper [1] were also discussed first experimental results on singlet oxygen production by optical pumping of fullerene-containing solid structures, placed into oxygen gas-filled chamber.…”

“…Earlier (see [1]) we have considered the possibility to create the fullerene-oxygen-iodine laser with optical, sunlight in particular, pumping (SL-FOIL). It is supposed that the singlet oxygen is produced via the interaction ofmolecular oxygen with the triplet state of fullerene, subjected to light irradiation.…”