Physics, 14.09.2019 09:30 fannylrevelo123
Fluorescence is a relatively faster phenomenon as compared with phosphorescence because of spontaneous emission of energy from s1 to s0. if it chooses the nonradiative path from s1 to a triplet state, t1 results in the slower decay of the process to reach the ground state s0. during this time interval, quenchers such as molecular oxygen can be involved in phosphorescence emission of the fluorophore. the process of quenching of the excited fluorophore in the triplet state by molecular oxygen can be one of the three different possible pathways such as energy transfer, electron transfer, and simple physical deactivation.
for the transition-metal complexes such as ruthenium, the energy-transfer mechanism is the most possible mechanism and it is dominated by the molecular collision thus limited by the diffusion of the quencher and is given by the stern−volmer relation. on the basis of the data derived from previous reports, a hydrophobic fluorophore of the ruthenium-based metal-ligand complex was selected for our sensing applications. to avoid the photobleaching effect of the fluorophore, a suitable substrate material has to be chosen and this provided broad adaptability to the specific needs. a fluorophore can be tethered or encapsulated onto a substrate material, and it can be in the form of a thin film or particle.
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Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?
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Diego kicks a soccer ball from the end line. his fellow students time and mark the soccer ball as it moves down the field. the graph represents the ball's progress. based on the graph, during what time is the velocity constant and positive?
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The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.
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